Certainly not my best photography, but my latest acquisition is a 2531.80 and I'm ecstatic.
It's running about +25 seconds/day and the service history is unknown, so I'll be sending it off to have that remedied soon.
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I sure hope it's just magnetized because that's a helluva a deviation for a supposed chronometer.
Hope it's not an Ebay purchase.
Good luck.
You can grab a demagnetiser from Amazon for less than £25 if post-service you are still experiencing that margin 👍