There are 3 Models with model number S1A in the database
Big Ben electric alarm clock in black Bakelite® case. Luminous dial.
Dates made: August 1931 - December 1934
Big Ben electric alarm clock in black Bakelite® case. Plain dial.
Dates made: August 1931 - December 1934
Big Ben electric alarm clock in Mahogany case. Non-luminous dial.
Dates made: August 1931 - April 30, 1935
