Hi Nismo,
The year of the Briggs and Stratton 3 hp motor is 1984 ,I think in 1983 they were the red Rover version of the 45 .
Could be an engine from a Rover 45
Looks like a good mower to restore.
I can't find much on the 03272 model number.
Spare parts can be found on eBay or here
https://www.scottbonnar.com/A Google search for a particular part may find more.
manuals here ttps://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/6371/scott-bonnar-manuals-parts-list.html#Post6371
History
https://www.outdoorking-forum.com.a...64933/model-45-history-record-c1968.htmlhttps://www.outdoorking-forum.com.a.../62970/re-some-scott-bonnar-history.htmlCheers
Max.