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).
List of order numbers for various chassis and aero engines.
| Identifier | ExFiles\Box 137\5\ scan0040 | |
| Date | 24th April 1920 | |
| X3720 PLEASE NOTE THE FOLLOWING ORDER NUMBERS. CHASSIS. X.3786. 50342 - Buzzard chassis. X.3481. 50075 - Goshawk " X.3893. X.3720. 50291 - American Parts or 3/19 Gearbox. X.2565. 735 - 40/50 Chassis. X.3408. 44836 - Hawk-Northcliffe. AERO ENGINE. X.3320. 69842 - Hawk engine. X.3252. 69843 - Falcon engine. X.3239. 70669 - Eagle " X.3254. 50467 - Condor " | ||