Hand-painted Round Wooden Trinket Box with Colorful Fish

I believe this wonderful vintage turned wood trinket box with hand-painted fish on top is likely one of a kind; I have found no other like it, and the irregularity of the edge of the black paint makes me think it was made to please its maker rather than for sale. I think the fish is just fantastic, rendered in a pale green, gray, and a soft yellow, with orange and red details, all popping against a glossy black ground.  

The box measures 3 3/4" in diameter and 2 1/4" tall with lid on. It is in very good condition, with some aging/cracking (but no chipping) to the black paint only.