Williams Component Dating
Many of Williams components are stamped with a letter code which denotes the year of manufacture as listed below. In the table the year is followed by the letter code. This can help to identify the date of a machine if you are confident that it is original equipment. Sturmey Archer of course also date stamped many of their hubs.| 1912/13-A | 14-B | 15-C | 16-D | 17-E | 18/19-E | 20-F |
| 21-G | 22-H | 23-I | 24-J | 25-K | 26-L | 27-M |
| 28-N | 29-O | 30-P | 31-S | 32-T | 33-U | 34-W |
| 35-X | 36-Y | 37-Z | 38-AA | 39-AB | 40-AC | 41-AD |
| 42-AE | 43-AF | 44-AG | 45-AH | 46-AI | 47-AJ | 48-AK |
| 49-AL | 50-AM | 51-AN | 52-AP | 53-AS | 54-AT | 55-AU |
| 56-AW | 57-AX | 58-AY | 59-AZ | 60-ZA | 61-ZB | 62-ZC |
| 63-ZD | 64-ZE | 65-ZF | 66-ZG | 67-ZH | 68-ZI | 69-ZJ |
| 70-ZK | 71-ZL | 72-ZM | 73-ZN | 74-ZP | 75-ZS | 76-ZT |
| 77-ZU | 78-ZW | 79-ZX | 1980-ZY |