yes, swan neck. I agree, the damasking finish is quite beautiful. Watch is from about 1916, based on the serial number.
This is a railroad grade watch. It has the lever set time feature, the highly legible dial with large Arabic numerals (also so-called Montgomery dial, named after the peson who designed it with the '6' in sub- seconds).
Quoted from another internet post:
"Mechanically speaking, almost all 1900鈥檚 railroad watches shared a number of performance and reliability enhancing features. Most had a fixed regulator to avoid timekeeping variation from impact (A), a double roller balance wheel to avoid going out of action (often called overbanking) (B), 19 or more jewels to reduce friction and increase consistency of the gear train (C), timekeeping adjustment in 5 or more positions to make sure the watch kept accurate time regardless of orientation (D), and adjustment for temperature to ensure accuracy in a variety of climates (E). Many railroad watches had solid gold or gold plated gear trains (F) and jewel settings (G) to reduce the effects of magnetism as well as reduce tarnishing, and later watches had features such as magnetically resistant balance wheels, Elinvar hairsprings, adjustments for isochronism, and advanced cap jewel covers (H)."
This pw has a gold balance wheel. Hamilton 992 movements have 21 jewels, adjusted to 5 positions, Brequet Hairspring. There are a lot on the market so parts seem to be readily available, but I don't know the details. I just had it serviced and it received a new mainspring, which was huge. I read that certain jewel set parts for the 992b movement are more difficult to find but these 992 are not bad. The 992b is supposed to be easier to service, more accurate, has a diiferent Hairspring more resistant to magnetism, but less well finished. Parts don't seem to be an issue, but I have limited experience.
Timing wise I read that the standard for railroad service was +/- 30 seconds per week, or about 4 sec/day. My watch does better when stem up on the night table. If I laid it down it lost more time. It was doing 2 to 3 seconds per day for a week, based on setting it to NIST and checking it later.
https://timegov.boulder.nist.gov/
This is my first PW so not an expert by any means.
@Canuck is one of our experts and there is an excellent pw thread on OF.
https://omegaforums.net/threads/calling-all-pocket-watch-buffs.127856/
I wanted to respond but don't mean to derail your thread. Like most things watch related, it can be a deep hole, the more you dig. But that's part of the fun.
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