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There isn't an exact date, but since 2 engines shown are mark 2, and the middle one is just series 70, am I right in saying that this would date the literature around 1972?
G'day Tyler
I think your determination in finding quality evidence is paying off here.
This is quality research.

I feel you have convinced us that Victa did use their early slide throttle
designs on much later commercial engines.

The Vol 1 Green book I have does not cover the 3D and 3L carbies.
I guess this is because they were mods to suit the commercial power plants.
Any ideas?

The earliest date for this literature is 1972 - when new Victa recoil starters were
fitted to the new decompressor engines. The brochure / booklet could
actually date from this time but could be dated to a few year's later.

Note the 1975 hand-written notation.
However, also note the old 1960's Victa 'V' logo on the cover ...
Is this Victa's clever attempt to separate two of its divisions?

No one seems to know when Victa disbanded its Industrial engine offerings.
Best guess, mid-to-late 1970s.

Cheers
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Jack