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Two cards (International warranty + Pictogram), unless you have a newer watch with a METAS-certified piece, which should then include a third card: the Master Chronometer card
The watch is a Seamaster diver 3oom co-axial and until now I'd not heard of METAS-certified
PhilipJI
Omega's naming scheme is a little stupid. Not sure if you're talking about the Seamaster Professional 300m (aka SMP) with the Helium Escape Valve on the left side of the case or the Seamaster 300 Master Co-axial without date and with exhibition caseback, but both of those only have 2 cards.
Watch changed, I now have another new one with the two cards and a tag.
Thanks to all for your help and advice.
PhilipJI