See Model Recognition Table and pre-war ID hints on Holdsworth Model pages
Bassed on the ‘Up-to-date Continental Design‘ this was a fast racing bike in its day avaliable pre-war only. Built with HM or Chrome Moly tubing Reynolds 531 was offered in 1938.
Model Recognition Table – This is a summary, pls see catalogues for full details
| Frame Number System & Location (Repeated on fork Stearer Tube) | Four Digits on side of Seat Lug and rear of Fork Crown, later on Steerer Tube. |
| Frame Tubing (Seat Tube ID – mm) | Reynolds HM or Chrome Molly, Plain Stays. Alt 531 in 1938 |
| Frame Angles, Head/Seat, (deg) | 1936/37 Seat 78, 1938 73/70 |
| Tube OD (Inch) – Top-Down-Seat | 1 – 1 1/8 – 1 1/8″ |
| Head Tube Lugs | Soild Cast |
| Fork Crown | BSA Drop Forged Wide |
| Head Set Type | Clip  |
| Seat Lug | Soild Cast |
| Seat Stay Attachment | To Side of Seat Lug, cut back  |
| Seat Stem Bolt | Nut & Bolt  |
| Bottom Bracket Lugs | Soild Cast |
| Gear Cable Run, Over/Under BB | n/a |
| Rear Stay Length (CBB – CDO) | Plain Gauge |
| Wheel Base (Spindle to Spindle) | 41 3/4″ |
| Rear Dropouts (Front) | Plate |
| Rear Brake Bridge | Straight?  |
| Brake Bridge Boss – Recessed Bolt | no |
| BB Hight | 11 1/4″ |
| Wheel Size | 27″ |
| Head Badge/Transfer | Transfer |
| Decals & Name Plate | Not Known |
| BB Cable Guides | no |
| BB Oiler | Yes |
| Gear Change Lever Lugs | no |
| Rear Stay Gear Cable Guides | no |
| TT Brake Cable Stops/Guides | no |
| Mudguard Stay Attachments | Tabs to Fork Blades and Rear Stays |
| Bottle Holder Bosses | no |
| Colour | Continental Blue or Choice |
| Chrome | Fork & Stay ends |
| Comments |