I think the one that I had was 1960's or 70's. As long as it's in good shape a solid Koa Kamaka ukulele should sound great. I don't know if it is a case of the wood "opening up'" with time.
Definitely 1970's. I bought that baritone through CL, and the little old lady had been storing it for son since then. He told her to just get rid of it cheap. I was lucky enough to be the first to message her.
That thing sounded amazing, but I'm just not a baritone player.