You'd think the receipt / record of sale would be enough... when I got my 2531.80 years ago, the AD gave me the box and cards belonging to a 2254.50. I was so enamored with the watch (my first) that I didn't check the cards until a later time. I sent a copy of the receipt to Omega and they issued me cards for my watch (the AD stopped carrying Omega so I couldn't go through them). That being said, I've since had a couple of warranty repairs/checks on other watches and taken my watches with cards in to an Omega Boutique (after learning from my mistake on the first watch, I definitely checked I had the proper cards upon purchasing later watches)... on each of these occasions the representative took the card into the back for some time, probably checking the authenticity as
@p4ul suggested. Perhaps it's possible for them to verify ownership either way but just easier with the card (they don't have to dig as deep).
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