We can try to find out with certainty from TAG Heuer, but my initial reaction is that it seems unlikely that TAG Heuer would have used this as a service case and marked this serial number to correspond to the number on the original case that was being replaced. Anything is possible, but I have never heard of this practice (and it seems like we would have heard about this, if it were occurring with any regularity).

Supposedly, there were some fake Monaco cases going around, maybe five or six years ago, which did not have any serial numbers. I would be worried that someone has taken one of these fake (reproduction) cases and added this number by a modern laser / engraving method.

Jeff

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: Hi Fabrizio
: good to hear from you, thanks for your thoughts
: Perhaps Catherine has an idea...
: all the best
: ciao