There are 6 Models with model number 201 in the database
Big Ben Style 4a Loud alarm in black (gunmetal) case. Has hanger on back.
Dates made: March 1, 1935 - April 27, 1939
Big Ben Style 5a Loud Alarm in black (gunmetal) case, non-luminous dial.
Dates made: July 15, 1939 - November 1946
Big Ben Style 5 Loud Alarm in black (gunmetal) case, non-luminous dial. Thinner case than style 5a
Dates made: November 1946 - March 1949
Big Ben Style 6 Loud Alarm in black (gunmetal) case. Non-luminous dial.
Dates made: March 1949 - April 1956
Single key wind movment, plastic lens, concentric alarm hand. First ones have nickel bezel, then brass.
Dates made: 1956 - 1964
Big Ben style 7 in white case with brass trim. Single key wind movement, plastic lens, concentric alarm hand.
Dates made: 1956 - 1964
