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).
Ink pad imprint of a Dunlop Cord front wheel tyre tread pattern after 1500 miles.
| Identifier | ExFiles\Box 45\1\ Scan306 | |
| Date | 1st September 1923 | |
| X4050 inside Pad of CHASSIS Front wheel Tyre. 45 lb/□ FRONT 1500 Miles ALMOST BRAND NEW DUNLOP CORD. outside Sept 1923 S.G./1923 | ||