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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 - 1926/1927): 15,000 Beats per hour

Center 60 9
3rd 56 8
4th 50 7
Esc 15 6
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).

Baby Ben Movement type 3 & 4 (1926/1927 - 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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