Apologies that my first thread here is a problem question.
I recently bought (new) a Blancpain Fifty Fathoms Bathyscaphe Day Date 70s. Nice watch you might think and you'd be right. Trouble is, it keeps horrible time. It came back from being looked at this morning. I sync'ed it with UTC 12 hours ago and it is now 15 seconds fast. Tomorrow morning it will be 30 seconds fast. And it's the same very day.
It's been sent back to Blancpain who said “During 5 days on cyclomat the watch lost 5 seconds in total, so 1 seconds per day. Which is within the brand tolerances. The watch was then stationary until the PR ran out which then the watch regained 4 seconds.
We are unable to replicate the fault advised by the customer so will return this watch”
I don't doubt that they're telling the truth and I'd be very happy with -1 spd. However, I don't understand the discrepancy between what I'm seeing and what they saw. I'm even willing to accept that the problem lies with me because this is the second one I've had and the first one was 30 seconds fast every day too.
So the question is: what am I doing wrong? I wear it while I'm awake and it sits dial up in a watch box when I'm not. It's not magnetized (and the movement is amagnetic anyway).
Something that does occur to me is the unidirectional winding may need more energy than my (fairly sedate) lifestyle gives it. But I wound it fully this morning and I would have thought that a wound-down movement would run slow anyway
Does anyone have any other suggestions as to what the problem may be?