Vintage 1960's Mod Stacking Porcelain Mug Cup Floral Motif Made in Japan

Vintage 1960's Mod stacking Porcelain mug/cup in a Floral Motif of red, yellow & green on white. Mug measures 3.25" h x 3.25" diameter at top. Unique curved handle. No crazing or stains. Tiniest of a chip along the rim (see last 2 pics). I almost missed it, but I was doing about my 3rd or 4th quality check & wanted to point it out.