Quote:
Originally Posted by Onequik135i
Are these newer 321 movements rated at COSC?
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There is no official certificate issued with the Caliber 321s. As for accuracy, I can only speak about my own, which averages +7 in all positions except for Crown-Down which runs at -8. Not within COSC iirc, but it works out in the end as when it's ahead more than 30s I simply store it overnight in the CD position.
As I noted in my OP, if you want improved accuracy, a 3861-equipped reference is the way to go. That the 321 is reasonably accurate is more than I expected.
On a side note, I was amazed to find out that running the chronograph (complication) has little impact on the accuracy or amplitude. My (new) El Primero 400 is much more impacted, running 2~3s slower (than without the chronograph running) and taking a pretty strong hit in amplitude.
