Yep, I would have dated it as an early-mid 1970's 'Premier 4', about the last of Masport's steel catcher models.
The engine was made on 10th March 1976 then, which is at the latter end of that range, so I'd say it's original to the mower. To add to grumpy's info, it has mechanical contact point ignition.
A 1972 TV ad for the 2-stroke version: [video][/video]
Cheers, Gadge
"ODK Mods can explain it to you, but they can't understand it for you..."
"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."
