The Westclox Greenwich electric alarm clock was introduced in the April 1936 Tick Talk magazine, with a retail price of $6.95. It is the most expensive Westclox illustrated in the October 19, 1936 Saturday Evening Post ad. It was discontinued in July 1939. This clock has the Sangamo self-starting synchronous motor and a spring driven bell alarm that is wound automatically as the clock runs. Two styles of this first model have been observed (Style 1 and Style 1a).
The style 2 Greenwich electric alarm clock was introduced on July 17, 1950.
The Greenwich Style 1 has a rectangular plain wood case, 5 3/8" tall, 5 11/16" wide and 2 1/4" deep. Dial has solid gold color center and black numerals. Beige alarm dial with black numerals. Gold second hand. Brass bezel. Model number S1-D on nameplate and bottom of feet.
The clock has an alarm winding key on the back. The movement uses a standard type of ratchet winding assembly for the alarm, and the alarm mainspring has brace on its outer end to allow it to slip inside the barrel to avoid overwinding.
The example above is dated 1 36 (January 1936) on the movement.
The Greenwich Style 1a has a rectangular fluted wood case, 5 1/4" tall, 5 7/16" wide and 2 1/4" deep. The dial has a striped gold color center and brown numerals. Gold alarm dial with brown numerals. Red second hand. Brown painted bezel. Model number S1-G on nameplate. Model number S1-D on bottom of feet.
The clock has no alarm winding key on the back. The movement has no ratchet on the alarm mainwheel assembly, and has a friction clutch assembly allows slippage to avoid overwinding. The outer end of the alarm mainspring is secured to a hook in the barrel.
The example above is dated 11 37 (November 1937) on the movement and is illustrated Courtesy of Jennifer Ward.
I have an example also dated 11-37 that has a polished brass bezel.
Greenwich Style 1a movement appears very similar, with no threaded arbor for alarm winding key, and a friction clutch instead of a ratchet.
Introduced July 17, 1950. Uses the M4 motor.
