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Discussion Starter · #1 ·
I’m curious whether anyone with the new Speedy Pro with the 3861 Co-axial Master Chronometer movement has measured their power reserve. I wound mine fully about 10:00 AM on Sunday morning, which was the only day I’ve worn it so far this week. I noticed last night (Tuesday) that it was still running at almost midnight. It stopped overnight at exactly 2:00 AM.

That means it ran for about 64 hours, which is far above the advertised 50 hours. Anyone else seeing similar numbers?
 

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My 3861 measured at 65 hours, +4 sec/day.
My 1861 measured at 50 hours + 5-7 sec/day.
I thought the 3861 spec. was 60+ hours.
 

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As many have reported, the 3861's PR commonly clocks in >60 hours.
 
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Discussion Starter · #4 ·

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That's funny that I came across this thread as I decided to see how long my new Speedmaster would last. It's 65 hours.

I recorded the start time at 11:52am on Monday (June 7), and now it's run out of juice at 5:35am on Thursday (June 10).
 

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65hrs for a chronograph (even if not in use) is pretty damn good
 
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