The Lancashire Gauge for determining watch sizes is of English origin, although its exact roots are not known. In this system, 1 5/30th of an inch is taken to be a base figure of zero.The measurement is across the narrowest part of the dial-side of the movement, and is thus used for round and non-round movements. Sizes smaller than zero are designated with a slash or a comma and numbers ascending. For example 6/0, 8/0 and 20/0 are decreasing watch sizes.
Some common Elgin pocketwatch sizes are 18, 16, 12, 8 and 6. The watch pictured here is a typical Elgin 12s watch in a 10 sided case.
| Watch Size | Inches | mm |
| 18 | 1 23/30 | 44.87 |
| 16 | 1 21/30 | 43.18 |
| 12 | 1 17/30 | 39.79 |
| 0/6 | 1 | 25.4 |
| 0/8 | 28/30 | 23.71 |
| 0/10 | 26/30 | 22.01 |
Watches are also sometimes measured in lignes (pronounced as "lines"). One lignes is one 12th of an old-style French inch. This is 2.25583mm.
There's more information about watch sizes here.
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