70s vintage Japan ceramic stackable mugs, retro floral blue & purple daisies & butterflies

Vintage Japan ceramic coffee cups, cute little mugs which stack for storage. This is a set of four mugs 3 1/4" tall (they hold 4 or 5 ounces comfortably).

One mug has a discolored spot to the interior (gray, not a coffee or tea stain from use). Aside from that, they look great. Nice and glossy, no wear to the design, no chips or cracks.