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dazooom · 20 September 2018, 01:55 PM

Looks like my vintage GMT 1675 is running kind of fast. Over 50 seconds/ day. Had it checked out at local AD. Would greatly appreciate it if someone could explain what all these numbers mean. Sorry if this is common knowledge here on TRF.

Frakis · 20 September 2018, 03:04 PM

I’m not sure what the numbers mean, but at +50 seconds/day means a movement service is required. Enjoy that beautiful timepiece!

Old Expat Beast · 20 September 2018, 03:30 PM

The numbers on the left show the seconds per day that the watch gains when it is positioned like the pics in the "Position" column. The numbers on the right show the amplitude (degrees of rotation in the balance wheel) in the dial-up and dial-down positions. Those two numbers are acceptable, and the watch might just need to be regulated rather than serviced, though a service probably would be a good idea.

RayShepherd · 23 September 2018, 11:19 AM

Quote:

Originally Posted by Old Expat Beast

The numbers on the left show the seconds per day that the watch gains when it is positioned like the pics in the "Position" column. The numbers on the right show the amplitude (degrees of rotation in the balance wheel) in the dial-up and dial-down positions. Those two numbers are acceptable, and the watch might just need to be regulated rather than serviced, though a service probably would be a good idea.

I'm here for the knowledge

SearChart · 20 September 2018, 04:06 PM

Magnetism anyone?

Old Expat Beast · 20 September 2018, 04:25 PM

Quote:

Originally Posted by SearChart

Magnetism anyone?

You're the expert Bas, but I thought magnetism added minutes per day rather than seconds?

SearChart · 20 September 2018, 04:30 PM

Quote:

Originally Posted by Old Expat Beast

You're the expert Bas, but I thought magnetism added minutes per day rather than seconds?

Oh it's definitely not always like that, in most cases it actually looks something like these results.

Old Expat Beast · 20 September 2018, 04:33 PM

Quote:

Originally Posted by SearChart

Oh it's definitely not always like that, in most cases it actually looks something like these results.

Thanks

AEC · 20 September 2018, 07:39 PM

Quote:

Originally Posted by Old Expat Beast

You're the expert Bas, but I thought magnetism added minutes per day rather than seconds?

This was my first thought. Amplitude looks great; rate hints at magnetization. It's an easy, zero-cost correction if so.

I'm surprised the AD who timed it didn't come to this same conclusion and offer to demagnetize it on the spot. Was it an in-house watchmaker who evaluated it?

dazooom · 23 September 2018, 10:25 AM

Quote:

Originally Posted by AEC

This was my first thought. Amplitude looks great; rate hints at magnetization. It's an easy, zero-cost correction if so.

I'm surprised the AD who timed it didn't come to this same conclusion and offer to demagnetize it on the spot. Was it an in-house watchmaker who evaluated it?

yes, it was an in-house watchmaker at an AD.

dazooom · 25 September 2018, 06:11 PM

Quote:

Originally Posted by AEC

This was my first thought. Amplitude looks great; rate hints at magnetization. It's an easy, zero-cost correction if so.

I'm surprised the AD who timed it didn't come to this same conclusion and offer to demagnetize it on the spot. Was it an in-house watchmaker who evaluated it?

Sorry to say it wasn’t magnetism. Took it to AD and had it retested.

dazooom · 20 September 2018, 04:52 PM

Thanks for the feedback.

Cheers

Nikrnic · 23 September 2018, 11:24 AM

I'd check to have it de-magnetised. I've heard of it adding seconds as well as minutes.

Sent from my SM-G900V using Tapatalk

dazooom · 23 September 2018, 11:54 AM

I'm gonna take your advice. I'll let you know how it plays out.

20 September 2018, 01:55 PM	#1
dazooom "TRF" Member Join Date: Sep 2009 Location: Virginia Beach VA Watch: Submariner 16800 Posts: 179	Calibration numbers help Looks like my vintage GMT 1675 is running kind of fast. Over 50 seconds/ day. Had it checked out at local AD. Would greatly appreciate it if someone could explain what all these numbers mean. Sorry if this is common knowledge here on TRF. Attached Images

20 September 2018, 03:04 PM	#2
Frakis 2024 Pledge Member Join Date: Mar 2016 Location: USA Posts: 2,940	Calibration numbers help I’m not sure what the numbers mean, but at +50 seconds/day means a movement service is required. Enjoy that beautiful timepiece! __________________ Two Factor Authentication Enabled On My Account.

20 September 2018, 03:30 PM	#3
Old Expat Beast TRF Moderator & 2024 SubLV41 Patron Join Date: Jul 2013 Real Name: Adam Location: Far East Watch: Golden Tuna Posts: 28,825	The numbers on the left show the seconds per day that the watch gains when it is positioned like the pics in the "Position" column. The numbers on the right show the amplitude (degrees of rotation in the balance wheel) in the dial-up and dial-down positions. Those two numbers are acceptable, and the watch might just need to be regulated rather than serviced, though a service probably would be a good idea. __________________ _______________________

23 September 2018, 11:54 AM	#14
dazooom "TRF" Member Join Date: Sep 2009 Location: Virginia Beach VA Watch: Submariner 16800 Posts: 179	I'm gonna take your advice. I'll let you know how it plays out. Attached Images

20 September 2018, 04:52 PM	#12
dazooom "TRF" Member Join Date: Sep 2009 Location: Virginia Beach VA Watch: Submariner 16800 Posts: 179	Thanks for the feedback. Cheers

23 September 2018, 11:24 AM	#13
Nikrnic "TRF" Member Join Date: May 2017 Real Name: Louis Nick Ric Location: Michigan, USA Watch: Blnr, Expll, Subs, Posts: 10,172	I'd check to have it de-magnetised. I've heard of it adding seconds as well as minutes. Sent from my SM-G900V using Tapatalk

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