I have a brass desk fan from the 1920's made by Veritys - There is a brass plaque with the words "BIRMINGHAM VERITYS Ltd England, Single phase AC Fan, Then stamped into the brass are the indevidual details:-
Volts 200/220 Watts 45, RPM 1400 Cycles 50 B.S.S. 380-1926" on the side of it