G'day Troy74 and speedy
I'm glad you posted this one.
In turf-care history, Ryan is a USA institution.

Yours presents as a 1960s or 1970s machine.
I would love to see the engine's Model, Type and Code stamped
into the Briggs' engine cowl.

That will give us a date, as the engine appears original.

I can't help but feel that Scott Bonnar based their Model 46 on the Ryan
design. What do you think? ...

https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/94767/model-46-scarifier-groover-c1960s.html

The great thing is that Ryan remains a key player in modern turf-care: -

https://www.schillergc.com/
http://www.ryanturf.com/

Your Ryan is an early design (with alloy chassis), but the name and
design principles remain in the current model: -
[Linked Image]

Cheers
---------------------
Jack

Attachments
Ryan-Ren-O-Thin-Spec-Sheet.pdf (407.63 KB, 2 downloads)