Poor Speedmaster slept in the bottom of the drawer for 15 years

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Lucked out means the opposite in the UK to what it means in the US.
Two peoples separated by a common language, indeed!
 
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There's a quick way to figure out whether it's a 321 or 861 Speedy! With my iPhone I can capture slow-motion videos. Then it's easy to see whether the chrono-second hand moves 5 or 6 times per second.

EDIT: sorry I guess I should explain better:

145.012 with 321 has a beat rate of 18000/hour = 5 times/sec
145.022 with 861 has a beat rate of 21600/hour = 6 times/sec