Photograph of a Bentley racing car with race number 7, competing at an event in Belfast.
| Identifier | ExFiles\Box 160\5\ scan0204 | |
| Date | 15th February 1941 guessed | |
| WELLWORTHY SIMPLEX RINGS MODERN TOOL & EQUIPMENT Co. LTD BELFAST DUNLOP 7 | ||
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).