Unusual and Terrific Old Made in Japan Painted Wooden Animal Blocks

I’ve never seen and can't find out there another set like these, a few of which are faintly stamped 'Made in Japan' on the back sides, and which I’d guess date to the 1920s or so. Terrific array of terrific looking animals with great color, and the best animals for stacking I’ve ever seen (or played with!) Set includes 14, all pictured, all of which are in very good shape, just some nibbles to the back sides of a couple as documented. I especially love the blue alligator, but all art really fabulous.

For reference, elephant measures 3 7/16" l x 3 1/8" t. Giraffe measures 2 7/8" t x 2 7/8" l.