Never would have thought to have seen this subject here.
My old Koa wood Kamaka, I owned from the mid 60's on. Its a basic model. Used to be pretty decent with it.
There's a crack on the back--took it in to inquire about a repair. One year waiting period, but now they use a cool tint clear finish, and use enough gloss coats to achieve the currently desirable smooth plastic-like coating look.
The warm (red) finish in this vintage has of course a warm glow, and...