G'day all

I'm just following here...

The first two of Paul's images I guess are the mower in question -
a model 11 side discharge of about the mid 1970s.
[the last image - as Max and Gadge said - is a rear-discharge
2-stroke - probably a Regent.

The vertical pull starter appears to be identical to the one
that first appeared on the K series 2-strokes in the 1970s.

I can't find direct evidence (from Rover) at this time, but the vertical pull was
used on 4-stroke Tecumsehs. This is shown is Scott Bonnar
rotaries at this time - https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/85034/booklet-domestic-range-c1973.html

By the 1980s - with the advent of the TVL? series engines, the
vert. pull was standard on Tecumseh verticals. These were fully imported
engines. Kirby had stopped production.
[see Max's Wolf and Vulcan images].

I guess these early vert. pull 2-strokes are rare on Rovers.
By this time Briggs engines were favoured by Rover.

One reason might be the uncertainty and ending of
Kirby engines here.

I have clear memories of when the new Tecumsehs first
appeared here on the Barons. These were far less popular than
the original 'yellow' 9 series Briggs powered Barons.

Cheers and thanks
-----------------------------------
Jack