Hello Andrew62

A warm welcome to these forums.
There is no shortage on information on these great mowers.

You have a first-model 14", Model 450415.
This little machine remains a firm favourite with collectors.

Introduced in late 1968 for the 1969 season, yours dates
(best guess) to late 1971, maybe early 1972.

https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/58161/BROCHURE_-_Domestic_Product_Li.html
https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/66494/Re:_MODEL_45_-_History_Record_.html

Please keep us advised as to progress.

--------------------------
Jack