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18s, 12s, 3/0... what does this mean?
Below is a table to convert American watch sizes (Lancashire gauge) watch size to inches and millimeters.
This measurement refers to the size of the movement as measured on the dial plate, not the case or dial.
20s; 1 5/6 inches; 46.56 mm
18s; 1 23/30 inches; 44.86 mm (Common Size)
17s; 1 22/30 inches; 44.02 mm
16s; 1 21/30 inches; 43.18 mm (Common Size)
14s; 1 19/30 inches; 41.48 mm
12s; 1 17/30 inches; 39.78 mm (Common Size)
10s; 1 15/30 inches; 38.10 mm
8s; 1 13//30 inches; 36.40 mm
6s; 1 11/30 inches; 34.70 mm (Common Size)
0s; 1 5/30 inches; 29.62 mm (Common Size)
3/0s; 1 1/10 inches; 27.94 mm
-Courtesy PocketWatchSite.com
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Guide created: 07/01/06 (updated 11/21/09)
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