There are 5 Models with model number 331 in the database
Black style 3 Baby Ben alarm clock with nickel trim. Luminous dial
Dates made: March 1932 - December 1934
Black (gunmetal) style 4 Baby Ben alarm clock with nickel trim. Luminous dial
Dates made: December 1934 - August 1939
Black (gunmetal) style 5 Baby Ben alarm clock with nickel trim. Luminous dial.
Dates made: August 1939 - January 1949
Black (gunmetal) style 6 Baby Ben alarm clock with nickel trim. Luminous dial.
Dates made: February 1949 - 1956
Black style 7 Baby Ben alarm clock with brass trim. Luminous dial.
Dates made: 1956 - 1964
