Railway pocket watch must have a WHITE face! At best, we can say that it is a pocket watch with a Montgomery dial. how many positions this clock is set to (railway clocks must have at least 5). What about temperature control and isochronism? Do they have a micrometric regulator? A pocket watch had to be approved by at least one railroad company to be a railroad watch. Standard Requirements (general, not from any specific rule book) The watch must be: US made size 18 or 16. Set with 17 or more jewels. temperature compensation. Lever positions Adjustment time up to +/- 30 seconds/week Featuring: Double roller Patented adjuster Steel escapement wheel Smooth dial (but "silvered" dials were allowed between 1910 and 1920) Featuring: Black Arabic numerals each show the minutes of the 12 hour at o'clock position
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