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).
Weight specification sheet for a 'HAWK.IRET.CLIFFE' item, detailing front, rear, and total weights.
| Identifier | ExFiles\Box 3\2\ 02-page088 | |
| Date | 19th April 1920 guessed | |
| WEIGHT. 4200 3.E.X. HAWK.IRET.CLIFFE. Front 19 cwts. 2 qrs. Rear 1 ton. 3 " 1 " __________________ 2 " 2 " 3 " Total. | ||