Dial scale of 0 to 300, what's that about?

[mikeh]

Tim,

Just a guess, but split second timing?

An 18kbph movement works out to 300bpm, or 5bps. (bph, bpm, bps = beats per hour/minute/second)

Regards,
Mike

[Tom McIntyre]

Essentially all English Center Second watches including the Waltham ones made for the English market are calibrated on the outer track for beats. i.e. 300 beats to the minute at 5 beats/second.

Tom McIntyre
Waiting...
Tommy the JOAT's Web (http://www.AWCo.org)

[Steve Cunningham]

It depends. If the numbers get smaller as the dial goes round toward 12:00, it could be a tachymeter. But if the numbers are constant, Tom is right.