Hi Richard and a warm welcome to the forum, its great to have another Scott Bonnar Model 45 owner on board! grin
Re: the age of your machine, with the engine being dated as April 1968 it would be an early machine possibly being manufactured in Thebarton South Australia in late '68.
Please note there is no correlation between the machine serial number and the age of the machine as they did not run sequentially. wink
Looking forward to your post and the pics.
Once again Richard, :welcome: to OutdoorKing
cheers2

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin