About the size notation of the ring
| Japanese China | America | England | France |
|---|---|---|---|
| No. 7 | 4 | H | 47.1 mm |
| No. 8 | 4 1/2 | I | 48.2 mm |
| No. 9 | 5 | J | 49.2 mm |
| No. 10 | 5 1/2 | K | 50.3 mm |
| No. 11 | 6 | L | 51.3 mm |
| Japanese China | America | England | France |
|---|---|---|---|
| No. 12 | 6 1/2 | M | 52.4 mm |
| No. 13 | 7 | N | 53.4 mm |
| No. 14 | 7 1/2 | O | 54.5 mm |
| No. 15 | 8 | P | 55.5 mm |
| No. 16 | 8 | P | 56.6 mm |