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 dispatch of 30 stamped test pieces to Mr. Purdon.
| Identifier | ExFiles\Box 36\3\ scan 086 | |
| Date | 19th May 1917 | |
| To Mr. Clark. X.3039 19.5.17. X.3039 X.2746 X.3040 30 test pieces sent to Mr. Purdon. 9 stamped M1 9 " P1 12 " P2 (Signed) A.K. | ||