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).
The commencement of a scored mark.
| Identifier | ExFiles\Box 127\3\ scan0132 | |
| Date | 20th October 1936 guessed | |
| M1193. A1493-7 A.1500. Commencement of scored mark. | ||