I have done a bit of digging for you, I can't find much on the mower itself, though I have some information on your engine.

Size: 122cc
Power: 3.3hp (@3200rpm)
Bore: 2.3125in (0.005in Wear Limit)
Stroke: 1.769in
Main Bearings: Ball Race
Big end Bearing: Needle
Small End Bearing: Caged Needle
Intake: Port Controlled
Carburettor: Flywheel Airflow Governed
Spark Plug: Champion J18Y or equivalent
Timing: 0.080in btdc
Spark lug Gap: 0.030in
Points Gap: 0.020in

All I can find so far about the mower leads me to think you have an early Rover Super 2, possibly 67-69, hopefully more will come up.



Cheers
Ty

____________________________
Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.