Although I am not a surfer I have had an interest in vintage surfboards for 40 years. I have quite a number of them. I'm generally only interested in single fin boards.... its all about the shape to me.
I bought another board today marked keyo. It looks to me like a 70s board - but what would I know. I would think most of my boards are from the 60s but like I said I have very little knowledge re the subject.
I would post some photos but it appears I am unable to do so at this point.