Set of 4 Cobalt Blue Ceramic Vertex Mugs

Rare cobalt blue mugs made of white ceramic by Vertex China during the 1980s. They stand about 4" tall with a 2.25" wide base and a 3" diameter top. There's some knicks to the outer layer from general use but no noticed spoon marks, chips, or cracks. This purchase is a set of four. ☕💙