...just to add...
There is actually a group of collectors for Japanese stencil drums. Most are really bad quality...but some are of acceptable quality... the drums, I mean...not the collectors... ;)...and, in the case of some vintage Yamaha maple kits, comparable-to-American kits of the same era quality.
However, as stated, most of these kits are made from luan wood...very soft and splinter-y wood that isn't stable and often deforms over time -very reactive to climate changes -as are most soft woods.
But, there are people who collect them...In some caes, the finishes were really cool. The "Tiger's Eye" wrap is quite fetching, if you ask me! ;) But champagne or gold sparkle probably isn't at the top of the list for collectors.