Hi Woodsy,

That is a good find! The sales ledger excerpt on this site shows one record for a similar mower with the same type of engine. The ledger date is 1942. The standard petrol mowers seem to have been available between 1936 and the early 1940's. You can see the record here:

https://www.outdoorking.com.au/forum/ubbthreads.php?ubb=showflat&Number=35237#Post35237

Cheers,
Sir Chook