Dean wrote:
The following is an extract from “A Portrait of Military Aviation in Southern Africa" by Ron Belling:
In the mid-70s, the Canberras were finished in matt PRU Blue (BSC636) overall, with reduced size castles on the fuselage only and fin flash as before. Wing walk lines on the wings were in black and most of the stencilling in orange-yellow. No underwing serials were worn, but the serial number was painted in small numerals on the rear of the fuselage with the last figure of the serial being repeated on the nose. Later, the insignia was deleted.
Must have been a very short lived scheme?
Photo Pg2.
https://www.sa-soldier.com/data/09-SADF-links/cassinga_raid/06appendix4a4d.pdf