A similar Russian Export set was exhibited at the Metropolitan Museum of Art, New York, in 1968:
“Eastern convention is followed in having a general instead of a queen, and an elephant instead of a bishop- with a rider for the “good” side, without for the “bad” side. Russian convention has ships for rooks, here they too are differentiated, by having double-masted on the “good” side, having only one mast on the other. The white king, general, and pawns are dressed like Roman soldiers...”
From Chess, East and West, Past and Present, Metropolitan Museum of Art, New York, figure 59.