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 for the numbering of 25/30-HP chassis units.
| Identifier | ExFiles\Box 101\3\ scan0047 | |
| Date | 15th October 1936 | |
| File 6500 15th October 1936. - Sheet 40 - LIST FOR NUMBERING 25/30-HP. CHASSIS UNITS. "N2" Series from 73 to 200 "O2" Series from 1 to 16. F-22-Y(N.73) E-22-Z(N.97) E-22-A(N121) D-22-B(N145) C-22-C(N169) B-22-D(N193) F-23-Y E-23-Z E-23-A D-23-B C-23-C B-23-D F-24-Y E-24-Z E-24-A D-24-B C-24-C B-24-D F-25-Y E-25-Z E-25-A D-25-B C-25-C B-25-D F-26-Y E-26-Z E-26-A D-26-B C-26-C B-26-D F-27-Y E-27-Z E-27-A D-27-B C-27-C B-27-D F-28-Y E-28-Z E-28-A D-28-B C-28-C B-28-D F-29-Y E-29-Z E-29-A D-29-B C-29-C B-29-D A-22-E Z-22-F Y-22-G V-22-J U-22-K T-22-L(O2.1) A-23-E Z-23-F Y-23-G V-23-J U-23-K T-23-L A-24-E Z-24-F Y-24-G V-24-J U-24-K T-24-L A-25-E Z-25-F Y-25-G V-25-J U-25-K T-25-L A-26-E Z-26-F Y-26-G V-26-J U-26-K T-26-L A-27-E Z-27-F Y-27-G V-27-J U-27-K T-27-L A-28-E Z-28-F Y-28-G V-28-J U-28-K T-28-L A-29-E Z-29-F Y-29-G V-29-J U-29-K T-29-L S-22-M R-22-N P-22-P N-22-R M-22-S L-22-T S-23-M R-23-N P-23-P N-23-R M-23-S L-23-T S-24-M R-24-N P-24-P N-24-R M-24-S L-24-T S-25-M R-25-N P-25-P N-25-R M-25-S L-25-T S-26-M R-26-N P-26-P N-26-R M-26-S L-26-T S-27-M R-27-N P-27-P N-27-R M-27-S L-27-T S-28-M R-28-N P-28-P N-28-R M-28-S L-28-T S-29-M R-29-N P-29-P N-29-R M-29-S L-29-T(O2.16) | ||