Existing comment:
Basic specification included: be open faced, size 18 or 16 [approximately 1.7 inches in diameter], have the winding stem at 12 o'clock, be lever set, use plain Arabic numbers printed bold and black on white dial, have bold black hands, have a minimum of 17 jewels, adjusted to at least 5 positions and isochronism, keep time accurately within a gain or loss of only 30 seconds per week, have a double roller and steel escape wheel. |