Pocket Watch Size Guide
The pocket watch sizes below refer to the movement size. These measurements are not related to the size of the case or dial. The chart below will convert American pocket watch sizes to millimeters. Check out the KeepTheTime collection of antique pocket watches here!
| Size | Inches | Millimeters |
| 20s | 1 5/6 | 46.56 |
| 18s Common | 1 23/30 | 44.86 |
| 17s | 1 22/30 | 44.02 |
| 16s Common | 1 21/30 | 43.18 |
| 14s Common | 1 19/30 | 41.48 |
| 12s Common | 1 17/30 | 39.78 |
| 10s Common | 1 15/30 | 38.10 |
| 8s Common | 1 13/30 | 36.40 |
| 6s Common | 1 11/30 | 34.70 |
| 0s Common | 1 5/30 | 29.62 |
| 3/0s Common | 1 3/30 | 27.94 |
