G'day vint_mow and Bruce,
Going by the curved ribbed section on top of the base it's an early version, the alloy starter instead of plastic also early and probably has the big early electronic ignition module.
So guessing around 1984 , with these mowers you really need the sticker number off the end of the air cleaner cap for identification. Could be a Sabre with the chrome bars or could just be a bitsa as a lot of bases rusted out.
The last one I had with an alloy starter was 1983.
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=70751Cheers
Max.
