WATCH SIZES
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 |
.966 |
10.87 |
24.55 |
| 8/0 |
28/30 |
.933 |
10.50 |
23.70 |
| 9/0 |
27/30 |
.900 |
10.12 |
22.85 |
| 10/0 |
26/30 |
.866 |
9.75 |
22.01 |
| 11/0 |
25/30 |
.833 |
9.37 |
21.16 |
| 12/0 |
24/30 |
.800 |
9.00 |
20.31 |
| 13/0 |
23/30 |
.766 |
8.62 |
19.47 |
| 14/0 |
22/30 |
.733 |
8.25 |
18.62 |
| 15/0 |
21/30 |
.700 |
7.87 |
17.77 |
| 16/0 |
20/30 |
.666 |
7.50 |
16.93 |
| 17/0 |
19/30 |
.633 |
7.12 |
16.08 |
| 18/0 |
18/30 |
.600 |
6.75 |
15.23 |
| 19/0 |
17/30 |
.566 |
6.37 |
14.39 |
| 20/0 |
16/30 |
.533 |
6.00 |
13.54 |
| 21/0 |
15/30 |
.500 |
5.62 |
12.69 |
| 22/0 |
14/30 |
.466 |
5.25 |
11.85 |
| 23/0 |
13/30 |
.433 |
4.87 |
11.00 |
| 24/0 |
12/30 |
.400 |
4.50 |
10.15 |
| 25/0 |
11/30 |
.366 |
4.12 |
9.31 |
| 26/0 |
10/30 |
.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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