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BAND SIZES

Watch bands today are measured in millimeters (mm). In the days of vintage Hamilton, this wasn't always the case. Below is a handy conversion guide.

Metric
Imperial Fraction
Imperial Decimal
12.7 mm
1/2"
0.5 in
13 mm
barely over 1⁄2 inch
0.512 in
14 mm
just under 9⁄16 inch
0.551 in
14.29 mm
9/16"
0.563 in
15 mm
barely over 9⁄16 inch
0.591 in
15.88 mm
5/8"
0.625 in
16 mm
barely over 5⁄8 inch
0.630 in
17 mm
just under 11⁄16 inch
0.669 in
17.46 mm
11/16"
0.687 in
18 mm
barely over 11⁄16 inch
0.709 in
19 mm
just under 3⁄4 inch
0.748 in
19.05 mm
3/4"
0.75 in
20 mm
just under 13⁄16 inch
0.787 in
21 mm
barely over 13⁄16 inch
0.827 in
22 mm
just under 7⁄8 inch
0.866 in
22.23 mm
7/8"
0.875 in
23 mm
barely over 7⁄8 inch
0.906 in
24 mm
barely over 15⁄16 inch
0.945 in
Hamilton Barrel B watch

Barrel B

1929-1935

Source: 

elginwristwatches.com

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