Hello gml
The Imperial was introduced for the 1968-69 season. At this time
there were no two-stroke versions.
The Imperial - like yours - was introduced for the 1972-73 season
(the 1973 Range). Victa would introduce their special version of the
Series 70 Mark 2 engine to the Imperials. This engine, fitted with the
Mark 2 decompressor, also featured a lower compression (via a head spacer),
and a special version of the G3 carby (the 3-357), that removed the air
vane governor.
I'm not sure of the end date: possibly as early as 1976.
Hope this helps.
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Jack
