Country of Origin: United States of America
3-D Test: 8 x 14 x 8cm, 0.7kg (3 1/8 x 5 1/2 x 3 1/8 in., 1 5/8lb.)
Metal, and glass
Cylindrical shaped panel mounted instrument, with white luminous figures on black face. 3-1/8 diameter; vacuum operated; World War II; luminous pointer.