A pair of two Frankenthal porcelain litron cups and their saucers, 18th century, circa 1775-1780
the grey monochrome ornamentations representing engravings of optical illusions, marked with the interlaced and crowned letters CC
Haut. 6 cm., diam. 14 cm. ; Height 2 1/3 in., diam. 5 1/2 in.