Hi again Cyberjack
I to found it strange they included the Victa V winged logo this late as i had an image in my head of a really early 60's victa ad with that logo on the cowling.
The carby on the Withco is (as far as i can tell) a 3L - i have read the 2 pages you attached earlier covering 3F, 3L and 3S, and it doesnt have the traits that is supposed to denote a 3S (jet colour and machining variance).
It could be a 3F though.
I also noticed the 1975 hand written notation - good spotting as I didn't see it the first time myself. It could date from that year, but would Victa still be selling series 70 125's after the mark 3 came out (74 I think?).
Maybe the manual was originally sold with a 125 power unit that wasn't moved until 1975?
If you have any other pages relating to the differences (internal or external) between the 3S, F, L carbs, I am more than happy to take the carby apart again to work out which one it is. That way we will have more clues to work out if they continued with the earlier 3F, 3L, maybe a combination of the 2 (3D?) or the 3S.
Cheers
Tyler