I’m not exactly sure about the Black. I think that possibly earlier ones were made in house but I feel others were outsourced for manufacture elsewhere & these even look slightly different. I’d say proper Koetsus start with the wood bodied ones. I’ve never been that taken with the Black (either version).
Early one?
and again
Later one made elsewhere
Note how body slopes up towards the front & gold coloured trim.
I’m sure I’ve seen one of this type with the label of the OEM supplier on it or its box.