Royal Crown Derby Art Nouveau. Tea Cup & Saucer Sets. Retailed by WM H Plummer Ltd. 7 East 35th St. & 695 5th Ave. Cobalt Blue Red Gold Light Red. & Green dot on white. Two of the date marks are 1937. The other one is. But do not know year (1938-39). Tea Cup: 4 diameter rim. 2 1/16 high at rim. 2 3/8 high to handle. 4 7/8 handle to rim. Saucer: 5 716 diameter.