Watch Sizes
By Michael Smallman
This table is the result of my wanting a quick-reference watch size table of my own. As you see, it gives imperial and metric equivalents of the traditional English/American system.
A more extensive table, followed by general conversion tables and also a mainspring size table, will be found in pages 285 of Henry B. Fried Watch repairer's manual, 2nd ed. (1961).
| Size | Thirtieths | Inches | mm | lignes |
|---|---|---|---|---|
| 0 | 35 | 1.17 | 29.63 | 13.26 |
| 1 | 36 | 1.20 | 30.48 | 13.64 |
| 2 | 37 | 1.23 | 31.33 | 14.02 |
| 3 | 38 | 1.27 | 32.17 | 14.39 |
| 4 | 39 | 1.30 | 33.02 | 14.77 |
| 5 | 40 | 1.33 | 33.87 | 15.15 |
| 6 | 41 | 1.37 | 34.71 | 15.53 |
| 7 | 42 | 1.40 | 35.56 | 15.91 |
| 8 | 43 | 1.43 | 36.41 | 16.29 |
| 9 | 44 | 1.47 | 37.25 | 16.67 |
| 10 | 45 | 1.50 | 38.10 | 17.05 |
| 11 | 46 | 1.53 | 38.95 | 17.45 |
| 12 | 47 | 1.57 | 39.79 | 17.80 |
| 13 | 48 | 1.60 | 40.64 | 18.18 |
| 14 | 49 | 1.63 | 41.49 | 18.56 |
| 15 | 50 | 1.67 | 42.33 | 18.94 |
| 16 | 51 | 1.70 | 43.18 | 19.32 |
| 17 | 52 | 1.73 | 44.03 | 19.70 |
| 18 | 53 | 1.77 | 44.87 | 20.08 |
| 19 | 54 | 1.80 | 45.72 | 20.45 |
| 20 | 55 | 1.83 | 46.57 | 20.83 |
| 21 | 56 | 1.87 | 47.41 | 21.21 |
| 22 | 57 | 1.90 | 48.26 | 21.59 |
| 23 | 58 | 1.93 | 49.11 | 21.97 |
| 24 | 59 | 1.97 | 49.95 | 22.35 |
