Hamilton pocket watch serial number dating
Hamilton had in the 1920's a sales and marketing brochure called the Timekeeper and it had a chapter explaining those adjustments: hamilton_adjustments.pdf, 238794 bytes Melamine resin (melamine formaldehyde) was one of the first widely used plastics.
It's the stuff you find on old light switches or old electrical sockets. It does not easily burn and is very resistant to chemicals.
It is done to maintain approximately the same rate of balance wheel oscillation, regardless of which of the specified positions the watch is in.
The 6 positions are: (1) dial up, (2) dial down, (3) stem up, (4) stem at 9 o'clock and (5) stem at 3 o'clock, (6) stem down at the 6 o'clock.
The Hamilton 992B regulator is adjusted not with a simple "F - S" lever, but with a spring loaded micrometer screw that adjusts the regulator far more precisely.
One full turn of the precision regulator screw changes the rate of the 992B by about 18 to 22 seconds per day.
If you use it and the watch is exposed to different temperatures and shaken or turned then you will achieve about /- 15sec accuracy per week.
A lot of other mechanical watches are off that much in just one day.
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Use the watch for at least a week before you change anything.
The Hamilton grade 992B is a high quality antique mechanical pocket watch.
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