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).
Log of vehicle series numbers against their corresponding weights in hundredweights (cwts).
| Identifier | ExFiles\Box 3\2\ 02-page037 | |
| Date | 21th November 1913 guessed | |
| X200 R.H.D 3 series Weight 500 35H.P. 19/20 cwts. 500. 40/50 H.P. 24/24 1/4 700 24 1/2 / 24 3/4 900 25 (cont) 1000 " 1100 24 3/4 / 25 1/4 1200 " 1300 " 1400 25 1/2 1500/50 25 1/2 1550-1699 25 3/4 1700 26 1/2 / 26 3/4 2000. 3075 3580/3570 2100/2200 3115 On average .. 3590/3115 2300/2600 3100/3130 2700 3150(struck through) 3200 .. Col 3250 | ||