Hi Nino, this is a very good point – thank you. I will follow up and let you know what the measurement shows.
By the way, I found the e-mail from Breguet service manager where he explained what they found when I sent the watch for repairs. His response reads:
"Please kindly note that your Marine watch's movement does not present any mechanical defect and none of its components is defective. However, a few points of oil have prematurely dried on some components and caused the watch to run ahead, a problem we have fixed by revising the movement (cleaning of its components and new lubrication of components needing oil)."
I am not a specialist, but I would expect that in a hermetically sealed watch the lubricant should not be drying up, but then again, I am not a specialist.
So, on your advise I am going to take the watch to a local watchmaker for measuring its frequency and report back his findings.
Best regards
Slava S.