Watch Size By Antique Time Vintage Watch Repair

The Lancashire gauge for determining watch sizes is of English origin and is the standard commonly used by American watch manufacturers. By this system 1 5/30 inches was taken as a basing figure and was called naught (0) size. Every 1/30 of an inch added increased the size one number, every subtraction of 1/30 of an inch decreased the size one number. The size of a watch is determined by its width through the center at the narrowest part of the dial side of the lower plate. The table below shows Lancashire gauge watch sizes in terms of fractions of inches, decimal inches, lignes and millimeters.

Watch Size Fraction Inch Decimal Inch Ligne Size Millimeter

18 1 inch 23/30 1.766 19.87 44.86
17 1 inch 22/30 1.733 19.50 44.02
16 1 inch 21/30 1.700 19.12 43.17
15 1 inch 20/30 1.666 18.75 42.33
14 1 inch 19/30 1.633 18.37 41.48
13 1 inch 18/30 1.600 18.00 40.63
12 1 inch 17.30 1.566 17.62 39.79
11 1 inch 16/30 1.533 17.25 38.94
10 1 inch 15/30 1.500 16.87 38.09
9 1 inch 14/30 1.466 16.50 37.25
8 1 inch 13/30 1.433 16.12 36.40
7 1 inch 12/30 1.400 15.75 35.55
6 1 inch 11/30 1.366 15.37 34.71
5 1 inch 10/30 1.333 15.00 33.86
4 1 inch 9/30 1.300 14.62 33.01
3 1 inch 8/30 1.266 14.25 32.17
2 1 inch 7/30 1.233 13.87 31.32
1 1 inch 6/30 1.200 13.50 30.47
0 1 inch 5/30 1.166 13.12 29.63
00 or 2/0 1 inch 4/30 1.133 12.75 28.78
3/0 1 inch 3/30 1.100 12.37 27.93
4/0 1 inch 2/30 1.066 12.00 27.09
5/0 1 inch 1/30 1.033 11.62 26.24
6/0 1 inch 1.000 11.25 25.39
7/0 29/30 0.966 10.87 24.55
8/0 28/30 0.933 10.50 23.70
9/0 27/30 0.900 10.12 22.85
10/0 26/30 0.866 9.75 22.01
11/0 25/30 0.833 9.37 21.16
12/0 24/30 0.800 9.00 20.31
13/0 23/30 0.766 8.62 19.47
14/0 22/30 0.733 8.25 18.62
15/0 21/30 0.700 7.87 17.77
16/0 20/30 0.666 7.50 16.93
17/0 19/30 0.633 7.12 16.08
18/0 18/30 0.600 6.75 15.23
19/0 17/30 0.566 6.37 14.39
20/0 16/30 0.533 6.00 13.54
21/0 15/30 0.500 5.62 12.69
22/0 14/30 0.466 5.25 11.85
23/0 13/30 0.433 4.87 11.00
24/0 12/30 0.400 4.50 10.15
25/0 11/30 0.366 4.12 9.31
26/0 10/30 0.333 3.75 8.46

Comparative values of standards of measurement. 1 inch equals 25.4 millimeters, 1 millimeter equals .03937 inches, and 1 ligne equals 2.25 millimeters.

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