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 comparison table for car components and total curb weight.
| Identifier | ExFiles\Box 126\2\ scan0182 | |
| Date | 8th August 1939 guessed | |
| -3- Item No. GROUP. Humber B.V. S.S. lbs. Humber B.V. Al. engine lbs. Difference lbs. Humber Saving B.V. Saving 31. (Including dash for Humber) Body with wings, seats, boards, acces. 1078 1071* 32 Complete car ready for road. 3480 3915 (These weights agree closely with actual curb weight. = 31.1 35 cwt. * Without dash centre floor board. | ||