G'day Jack and crew,
Quite so, and Victa's 1971 published 2nd edition service manual had the blue cover - still just a stapled binding, though, so not all that durable.
This was superseded in 1974 by Gregory's #102, which was endorsed as their 'official Mower Manual' by Victa Ltd.
This was also the first Gregory's/SP manual to use the actual Victa logo on the cover.
Ozwrenches currently have a rather ratty copy of the Victa first edition for sale, by the way, as well as a Gregorys #220!
Their pricing is quite reasonable, too.
https://ozwrenches.com/manuals-mowers.htm