Here’s the skinny on
@LesXL ‘s Illinois watch:
https://pocketwatchdatabase.com/search/result/illinois/4557476
The Meggers & Ehrhardt “blue book” on Illinois says:
Temperature, three positions, isochronism, jewels in raised settings, rounded spoke train wheels and polished gold centre wheel, patent regulator, gold inlaid or regular, damascened, nickel gold or black filled engraving, gilded or nickel polished oval headed plate screws, double sunk glass enamel dial.
The subject Illinois watch is single-sunk, not double-sunk, but I feel the dial is correct. The listings in the “blue book” are based on observed examples, and perhaps the sample they describe, had the double-sunk dial. This grade was introduced in 1912 (s#2415001), and by 1924 or 1925 when the subject watch was made, the double-sunk dial was likely no longer used on this grade. Nice watch. Not railroad approved.
They also say that all but the earliest s# were double roller, even if the movement is not marked. The subject watch can safely be said to be double roller, even though it is not marked. This watch would have been approved for use on urban transit.
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