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FREQUENTLY ASKED QUESTIONS
How to determine what size the
watch is?
Movement Size Scale: American
Movement Sizes (Lancashire Gauge)
Size Inches Inches Mm Lignes
18/0 18/30 .600 15.24 6
17/0 19/30 .633 1608 7 1/8
16/0 20/30 .666 16.92 7
15/0 21/30 .700 17.78 7 7/8
14/0 22/30 .733 18.62 8
13/0 23/30 .766 19.46 8 5/8
12/0 24/30 .800 20.32 9 1/8
11/0 25/30 .833 21.16 9 3/8
10/0 26/30 .866 22.00 9
9/0 27/30 .900 22.86 10 1/8
8/0 28/30 .900 23.70 10
7/0 29/30 .966 24.54 10 7/8
6/0 1 1.000 25.40 11
5/0 1 1/30 1.033 26.24 11 5/8
4/0 1 2/30 1.066 27.08 12 1/8
3/0 1 3/30 1.100 27.94 12 3/8
2/0 1 4/30 1.133 28.78 12
0 1 5/30 1.166 29.62 13 1/8
1 1 6/30 1.200 30.48 13 1/2
2 1 7/30 1.233 31.32 13 7/8
3 1 8/30 1.266 32.16 14
4 1 9/30 1.300 33.02 14 7/8
5 1 10/30 1.333 33.86 15 1/8
6 1 11/30 1.366 34.70 15 3/8
7 1 12/30 1.400 35.56 15
8 1 13/30 1.433 36.4 16 1/8
9 1 14/30 1.466 37.24 16
10 1 15/30 1.500 38.10 16 7/8
11 1 16/30 1.533 38.94 17
12 1 17/30 1.566 39.78 17 5/8
13 1 18/30 1.600 40.64 18 1/8
14 1 19/30 1.633 41.48 18 3/8
15 1 20/30 1.666 42.32 18 3/4
16 1 21/30 1.700 43.18 19 1/8
17 1 22/30 1.733 44.02 19
18 1 23/30 1.766 44.86 19 7/8
19 1 24/30 1.800 45.72 20
20 1 25/30 1.833 46.56 20
Swiss Movement Sizes
Lines with their equivalents in Millimeters and Decimal Parts of an Inch.
(Lignes)
Decimals Inches Millimeters
7 .622 15.79
8 .710 18.05
9 .799 20.30
10 .888 22.56
11 .977 24.81
12 1.066 27.07
13 1.154 29.32
14 1.243 31.58
15 1.332 33.84
16 1.421 36.09
17 1.510 38.35
18 1.599 40.60
19 1.687 42.86
20 1.776 45.11
21 1.865 47.37
22 1.954 49.63
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