There are 3 Models with model number 231 in the database
Does not say Chime Alarm on dial, just Westclox Big Ben. Factory number became 69-A in 1932.
Dates made: June 1931 - August 1934
Big Ben Style 4 Chime Alarm in black case. Luminous dial.
Dates made: August 1934 - August 1939
Style 5 Big Ben Chime alarm black (gunmetal) case, luminous dial.
Dates made: August 1939 - January 1949
