G'day
Undeez, and a warm welcome to the ODK Forums.

Our resident Scott Bonnar aficionado Mod will be along directly, and will be able to fill in the details.
But I'd say what you have there is actually a 16" cut 690 Series. So it is badged as a Scotty, but was actually made by Morrison Mowers in New Zealand.
Here's a past discussion on these;
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=40322