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Discussion Starter #1
My Breguet Marine 5817ST has a different looking balance spring setup than the pics I have seen from others on the web. In the picture below, mine is the one shown surrounded by a red box, whereas the pic to the left of it is one that I found on the web.

balance.jpg

The other pic shows a + and - adjustment, whereas mine does not seem to have that. Does that mean that mine has a silicon balance spring?

I don't really care one way or the other. I know that there are both advantages and disadvantages to silicon. I'm just curious which one I have.

Thanks for any information!
 

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Hi!

That's a very intriguing question, I do not have the answer. It seems that this model has had a few different balance springs and regulation methods, because I even found on the web pictures of the balance wheel with adjustment screws mounted on the balance for the regulation. Picture below.
An email to Breguet could clear that out maybe?

watch-club-breguet-marine-40mm-grande-date-full-set-ref-5817-year-2014-6.jpg
 

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Definitely not free sprung. The balance on yours is smooth. The watch with the adjustable weights on the balance is free sprung.

Thanks! Based on the post in that thread, I’m guessing mine is free sprung but not silicon but still unsure on both points.
 

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Discussion Starter #6
Definitely not free sprung. The balance on yours is smooth. The watch with the adjustable weights on the balance is free sprung.
Why then did they remove the +/- label? I don’t see any way to regulate it.


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Amin Sabat...Hello!

What a fine watch...and great images, too.

Historically, watches that were Free Sprung tended to be of the finest quality, since they required the greatest amount of individual adjustment. This being said, it's also interesting to note that non free-sprung watches were rather easily capable of performing at the highest levels. To some extent, then, it may be reasonable to assume that free-sprung watches--although, if properly done, certainly functioned at the 'Top of the Chart'--were as much an indication of what a Factory 'could do', as what 'should' be done...

As a quick aside: the vast majority of American Railroad Grade pocket watches were not free sprung--I'm guesing it was 99% (!)--and they were expected to run to within +/- 30 seconds per week...in actual, frequently rough, use. Pretty good, methinks!

Michael.
 
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