The GMT 1675 movement, is it a 1570 or 1575

[Sohorolex]

Please help me i feel like I'm going mad. I would love to know if there is any difference between a 1570 movement and a 1575 other than the date. Its just that i have seen the movement number in GMT's and Orange hand Explorer 2's and it looks like 1570 to me. So if a movement is stamped 1570 and has a date facility does that mean that it also has the GMT facility?

I would be very great full for any help.

Regards,

Sohorolex

[SPACE-DWELLER]

Welcome to TRF!

The GMT 1675 used the Cal. 1575 movt.

The 1570 was used in for instance the COSC rated Sub 5512 (no date).

[Sohorolex]

Thanks for the welcome Bo, but does the movement have '1575' stamped on the movement or '1570'.

[SSD]

Should be 1575, I believe.

[mike]

It's a 1575 though it could be stamped 1570.

[mike]

Let me amand that. I'm assuming your watch is sometime after 1965 or so? If not could be a 1565.

[Sohorolex]

So how would you be able to tell if a 1570 movement had the 24 hour capability of the 1655/1675 if just stamped 1570?

[BiG JeEzY]

Originally Posted by Sohorolex

So how would you be able to tell if a 1570 movement had the 24 hour capability of the 1655/1675 if just stamped 1570?

Well I like to say that the since the 1570 was used on the Sub 5512, the 1570 should not have a 24 hour hand on it. In other words, the 1570 is one of the older predecessors to the 3135 movement seen in todays Submariners.

Your watch should have the 1575 movement on it, which is also one of the predecessors to the 3186 on the GMT today.

The only difference between the 1570 and the 1575 I think would be the 24 hour hand for the 2nd timezone. The much older 1565 movement on the other hand, I think features a "non hacking" movement but I don't have as much expertise on vintage watches as some others do so I may be wrong.

Welcome to the forums!

[mike]

The 1570 and the 1575 are the same movements. The addition of a "5" indicates a date feature. The fact that some 1675s have 1570 stamped on the bridge is simply Rolex used what ever was on hand at the the time.

1680 with 1575,

[BiG JeEzY]

I forgot to add, I just checked the service papers on my 1675 GMT that was manufactured in the year 1978, it says it has the caliber 1575 on the papers.

[BiG JeEzY]

Originally Posted by mike

The 1570 and the 1575 are the same movements. The addition of a "5" indicates a date feature. The fact that some 1675s have 1570 stamped on the bridge is simply Rolex used what ever was on hand at the the time.

1680 with 1575,

Oh....I stand corrected, I take back what I said earlier...whoops!

[Sohorolex]

Thankyou all for your help with my first post, loving the detail. So to some up, the 1570 movement and the 1575 are the same except for the date facility which gives the 5. So would this mean that you could use the movement from a sub 5512, wth the adition of a 24 hour hand and replace the movement in an orange hand explored 2?

[SSD]

Originally Posted by BiG JeEzY

Oh....I stand corrected, I take back what I said earlier...whoops!

Me. too. You learn something every day here!!!

[rdparri56]

First a comment about the 1570/1575 calipre, followed by a question or two about the other GMT movements.

I also have a 1970 (based on serial #) Rolex GMT with a 1570 Calipre. When I bought the watch in about 1982 it was pretty well trashed. The previous owner was a welder and there was weld spatter everywhere, including on the SS case. I had the watch rebuilt and installed a new band and it has been a good friend ever since. Regarding the movement, I feel confident that the 1570 was original, I'm sure that the first owner never took the watch in for anything. The first owner was English, I wonder if this might have something to do with the different numbers. Also, I'm wondering if a more accurate way to label the movements might be something like 1570 with 5 stacks of wafers (a apologize for not knowing the tech terms)? I'm not a watchmaker, but when they disassemble my watch, I'm always fascinated to see the beautiful stack of wafers as the watch is being disassembled.

One question I have about the 1675 - 1570/1575 calipre (1575 movement for the most part). Is this movement less robust than the 3075, 3085, 3175 or 3185? I'm thinking of moving up and giving my old friend a rest in a jewelry box.

[mike]

Originally Posted by rdparri56

First a comment about the 1570/1575 calipre, followed by a question or two about the other GMT movements.

I also have a 1970 (based on serial #) Rolex GMT with a 1570 Calipre. When I bought the watch in about 1982 it was pretty well trashed. The previous owner was a welder and there was weld spatter everywhere, including on the SS case. I had the watch rebuilt and installed a new band and it has been a good friend ever since. Regarding the movement, I feel confident that the 1570 was original, I'm sure that the first owner never took the watch in for anything. The first owner was English, I wonder if this might have something to do with the different numbers. Also, I'm wondering if a more accurate way to label the movements might be something like 1570 with 5 stacks of wafers (a apologize for not knowing the tech terms)? I'm not a watchmaker, but when they disassemble my watch, I'm always fascinated to see the beautiful stack of wafers as the watch is being disassembled.

One question I have about the 1675 - 1570/1575 calipre (1575 movement for the most part). Is this movement less robust than the 3075, 3085, 3175 or 3185? I'm thinking of moving up and giving my old friend a rest in a jewelry box.

I'd be hard pressed to say "less robust". So many of these old 15xx movements have been exposed to the harshest conditions their owners could stand and never missed a beat.

One fine collector I have the greatest respect for has called the 15xx an "over engineered monster". I'm not a watchmaker, but over the years (some since new) my 15xx movements have consistently been some of the most consistent/accurate watches I have.

I do think with the advent of the 3xxx fastbeat movements Rolex raised the bar as to consistency.

Interestingly the 3085 had a very short life in the Rolex scheme. One watchmaker has called it a "bear" to work on. I have to bow to the knowledge of the watchmakers here for any difinitive comment.

[rdparri56]

Originally Posted by mike

I'd be hard pressed to say "less robust". So many of these old 15xx movements have been exposed to the harshest conditions their owners could stand and never missed a beat.

One fine collector I have the greatest respect for has called the 15xx an "over engineered monster". I'm not a watchmaker, but over the years (some since new) my 15xx movements have consistently been some of the most consistent/accurate watches I have.

I do think with the advent of the 3xxx fastbeat movements Rolex raised the bar as to consistency.

Interestingly the 3085 had a very short life in the Rolex scheme. One watchmaker has called it a "bear" to work on. I have to bow to the knowledge of the watchmakers here for any difinitive comment.

Mike, thanks for the information. Pehaps I will just stick w/ a known quantity and not purchase another watch, because I really like the watch. The problem with my GMT is that it seems like something breaks every 3 or 4 years. I'm not complaining, it will be something minor that I notice: the last thing was the adjustment crown stem unscrewed. When I took it in I was told that they couldn't just tighten the stem in, but the problem was an intermetale wheel (I'm' reading from the reciept). From my perspective, I'm not abusivie: I don't throw the watch through widow fans or anything, but I do wear the watch for almost everything I do, including gardening, rig visits, camping, swimming, home repairs, etc... I was just thinking that a newer perhaps better engineerd movement might be the way to go for someone that does things and wears his watch during lifeday activities. No doubt, I'm rationalizing a justification for a new watch, but I know that I will catch real abuse from my "better-half" if a new expensive watch is in the shop more than the old watch! Thanks again, Rick

[rdparri56]

Further note: I've got a serial number designating my 1675 model number watch to be a 1970 year model (case number 297xxxx, if someone could double check me), but my watch has the hacking feature, which if I understand correctly means that when the crown is pulled all the way out, the second hand stops, which it does. According to the website: http://www.gmtmasterhistory.com/gmt-..._ref_1675.html the hacking feature was introduced in 1971. So I’d be interested to know: Are there other watches out there with the hacking feature showing up back in 1970? One more question, we have mfg dates for case numbers, any way to correlated a year of mfg date to the internals of a Rolex?
Thanks!

[mike]

Originally Posted by rdparri56

Further note: I've got a serial number designating my 1675 model number watch to be a 1970 year model (case number 297xxxx, if someone could double check me), but my watch has the hacking feature, which if I understand correctly means that when the crown is pulled all the way out, the second hand stops, which it does. According to the website: http://www.gmtmasterhistory.com/gmt-..._ref_1675.html the hacking feature was introduced in 1971. So I’d be interested to know: Are there other watches out there with the hacking feature showing up back in 1970? One more question, we have mfg dates for case numbers, any way to correlated a year of mfg date to the internals of a Rolex?
Thanks!

There seem to have been a lot of questions reguarding that site. Saying anything absolutely about Rolex is taking a big chance.

It's generally felt the hacking feature was introduced in the early 70's. I have a 2.5 mil. 1680 RED that does not hack (III/70 inside caseback), and I know one collectors that has one earlier than mine that does.
I'm also aware of one collector that has a datejust from 1965 that hacks!

The only thing we know for certain is there is no bright line rule with Rolex.

As to your second question, Rolex movements are given a number that "ties" them to the case number.

[lwsii]

hate to resurrect an old thread as my first post, but this (1675) & google how I arrived.I purchased mine used in 1977, I checked serial # years ago and it was around 1961 birthdate (if I remember right), I had it serviced and had the bezel replaced (I hooked it on the side of a livestock trailer & it was gone) in 1996, in 2007 cracked the crystal & had it replaced & serviced. It has been worn everyday (24/7) for 34+ years and whenever I have to adjust the date forward (non 31 day months), it is about 4 minutes slow. Best $1500 I ever spent.
I realize this is probably of little use to 'rdparri56' 18 months ago, but I thought it was interesting.

[Lol-x]

$1,500 for a 1675 GMT is great buying but that was 1977.

Today you would pay at least 3 times that amount.

Seems to be keeping very good time

[HL65]

Originally Posted by mike

There seem to have been a lot of questions reguarding that site. Saying anything absolutely about Rolex is taking a big chance.

It's generally felt the hacking feature was introduced in the early 70's. I have a 2.5 mil. 1680 RED that does not hack (III/70 inside caseback), and I know one collectors that has one earlier than mine that does.
I'm also aware of one collector that has a datejust from 1965 that hacks!

The only thing we know for certain is there is no bright line rule with Rolex.

As to your second question, Rolex movements are given a number that "ties" them to the case number.

Unfortunately Mike some of that has to do with unscrupulous watchmakers as well. But you are right--that with Rolex one never does know.

[cat1pro]

Good evening everyone. Is it possible for a 1675 with a 5million or 6million serial number to contain a 1570 movement?

[springer]

Originally Posted by cat1pro

Good evening everyone. Is it possible for a 1675 with a 5million or 6million serial number to contain a 1570 movement?

The movement is a 1575 but stamped 1570.

So yes, your movement is correct.

[cat1pro]

Thank you. Just recently picked one up. One more question. I know I shouldn't polish the case. What is acceptable to do to the crystal? It is pretty scratched up.

[southtexas]

Originally Posted by cat1pro

Thank you. Just recently picked one up. One more question. I know I shouldn't polish the case. What is acceptable to do to the crystal? It is pretty scratched up.

Polish or replace. It’s a simple wear item.


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