Accuracy

[watchmework]

Originally Posted by Spartans71

I hear you. I just feel that if I pay a lot for something, and it’s not in specs (although still very close) shouldn’t I get what I pay for?

It seems like the only way you're going to be happy is to take the watch in to the RSC and have them take a look at it. I'd caution you though that you never know and you could get your watch back and something else could be wrong with it...not saying it will happen but I've seen where other members send their watch in for something small and it comes back with a scratched case or something like that. Best of luck in your decision

[csaltphoto]

I would give it some time. I bought an unworn 5 digit sub that needed a service (It was running about +10, low amplitude, etc. Lube had dried out). After that it varied from about +1.5 to +2.5/day (based on a week). After a few months it settled in to less than +1/day. The service was about 6 months ago.

[77T]

Originally Posted by Spartans71

I hear you. I just feel that if I pay a lot for something, and it’s not in specs (although still very close) shouldn’t I get what I pay for?

I believe you are interpreting the -2/+2 accuracy target as some sort of guarantee.

It is the design parameter that they use to calibrate movements before leaving the factory. As some have explained, your watch is operating in a real world environment versus a factory or COSC lab.





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[Bob_Loblaw]

Anyone concerned enough to post to this forum regarding the accuracy of their mechanical watch, is well advised to look closely into what to expect from a mechanical watch generally, and how their watch, in particular, functions from day to day and over a period of months.

I have several self-winding watches. I currently have 3 that I keep wound exclusively by wearing them. Every morning I note on a spreadsheet how much time they have lost or gained. One has gained 7 seconds in the last month and 0 seconds over the last week.

I have a Timegrapher. Once a month I take readings every 2 minutes for 10 minutes for each of the three values at each position. I then average those for a final result for each of six positions. Values from those positions are then averaged showing values for the watch.

The data from the Timgrapher shows me that one watch will gain 6 s/d in the crown right position and will lose 1 s/d in the crown left position. Leaving this watch in the crown left position at night has resulted in it gaining 0 s/d over the last week. It is a 114270.

Another watch gains a rather consistent 12 s/d as measured daily which closely corresponds to the Rate in each position. Its Amplitude ranges from 232 to 269 and its Beat Error ranges from 0 to 0.3 in various positions. Its values are consistent over ten minutes in each position. I am not a watch professional, but given that this is an Explorer II 16570 I think it may, at the very least, need to be regulated.

I provide this detail merely as an example of what knowledge of the inner workings of a mechanical watch may reveal. The data mentioned here applies only to these two watches. The data is different for each watch and reveals different things about each watch. What I do based on that data is different for each watch. Anyone concerned enough to post to this forum regarding the accuracy of their watch would be well advised to look deeper into how their watch functions. One useful article, there must be others, is "The Concept of Timing” by Walt Odets, https://www.timezone.com/2002/09/16/...-xii-part-2-1/. The experience of the doctor mentioned in this article illustrates the variance we may unknowingly introduce into a watches function.

As controversial as it may be to some here and knowing how a little knowledge can be dangerous, I suggest anyone concerned enough to post to this forum regarding the accuracy of their watch would be well advised to understand how to use a Timegrapher and what its results may indicate.

David Letterman: “Why do you wear two watches?“
A Besotted Peter O’Toole: “Because I don’t want to waste time looking at the wrong wrist."

[The Libertine]

Originally Posted by watchmework

It seems like the only way you're going to be happy is to take the watch in to the RSC and have them take a look at it. I'd caution you though that you never know and you could get your watch back and something else could be wrong with it...not saying it will happen but I've seen where other members send their watch in for something small and it comes back with a scratched case or something like that. Best of luck in your decision

So. Very. True.