Price check: Momo Prototipo 350mm steering wheel

I've had this wheel a fairly long time and would like help identifying vintage and an estimation of value.

I'd appreciate the input from those that know.

Thanks, John

John,

Please post the diameter in mm ...

Cheers

My swag is 2nd-3rd Gen, early 70s. Stitching on the backs of the spokes, stitches per inch and Prototipo logo are all
Clues to me. Date code stamps started around ‘74-75.

I'd say later 78+ but I miss the date stamping too

Any estimate as to value? I haven't decided to sell at this point, but it would be nice to know.
Thanks for the input.
Best, John

John, as Chuck has asked 'post the diameter' as this is of utmost importance as to its value.

I made the change in the title of the post to show the size as 350mm. I don't see how to change the title on the first page.
I'd be glad to do it if I knew how.

^^^^ title updated