stackable stoneware pottery soup mug bowls w/ cup handles, Japan chrysanthemum & bamboo pattern

We love these 1970s or 80s vintage Japanese stoneware pottery soup mugs, with the zen-like floral / bamboo design.

These are unmarked, possibly Otagiri? It's a set of four pieces, all 4" diameter x 2 2/3", all showing a little wear and discoloration.