Big Ben & Baby Ben Train Counts

Style 2 Big Ben and Baby Ben advertisement from 1929

The first advertisement for Westclox baby Ben dated 1915

Westclox Movement Train Counts and Beat Rates

Big Ben Loud Alarm: 15,000 Beats per hour
Center	64
3rd	60	8
4th	50	8
Esc	15	6

Big Ben Chime alarm: 14,400 beats per hour

Big Ben Model 75 Single Key Wind - 1956 - ?: 12,600 beats per hour
Center	60
3rd	49	7
4th	49	7
Esc	15	7

Baby Ben Movement type 1 & 2 (1912 - 1926/27): 15,000 Beats per hour
Center	60	9	Type 1 has a 56 tooth main wheel (for 30 hour operation). Type 2 has a 59 tooth mainwheel (for 32 hour operation). The center pinion is the same count on both types but they are not interchangeable. (Info courtesy Jeff Wood).
3rd	56	8
4th	50	7
Esc	15	6

Baby Ben Movement type 3 & 4 (1926/27 - 1960): 14,400 beats per hour
Center	60	9
3rd	56	8
4th	56	7
Esc	15	7

Model 66 Movement: 13,440 beats per hour
Great	60
Center	60	10
3rd	49	7
4th	49	7
Esc	16	7

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