Background information The 7191 is the second Tanaka style LordMatic watch manufactured by the Suwa factory. The previous model 7190 had a monolithic case. The 7191 looks identical but uses a screw back case and has no parts in common. The design is similar to Tanaka style King Seikos of this period from Suwa, with an elegant dial and clean lines. Seiko offered the 7191 model from 1972 to 1974 in multiple variations.