70s vintage coffee cups or mugs, red blue green yellow bronze brown drip pottery

Set of four 70s vintage Japan ceramic coffee mugs, all in very good condition (not marked). They measure 4" tall, and hold 8 ounces.

These are a lovely copper or bronze metallic color with different color accent (red, blue, green, yellow) which looks like the four elements fire, water, earth, air to me - very zen, I think. And totally in keeping with the earthy, hippie style!