^
Contact the Swatchgroup SC in Weehawken, NJ, giving them the serial number.
If you’ve no joy there, try Switzerland directly.
Be warned though, many brands don’t keep meticulous records, and may not want to reveal production date as the owner could then tell if it sat unsold for quite some time.
Hopefully, Blancpain won’t be shy about coming forward with the relevant info.
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