For what it’s worth, I had the same thing happen to me. I bought a Speedy at Royal Quartz in Paris and they didn’t stamp the warranty card. I when I got home I called the store and they said I only needed the receipt.
I needed a size adjustment so I took my watch to my local Omega Boutique and while I was there I asked them about the blank warranty card. The sales rep looked up my watch and info in their system and told me he thought me watch was a grey market watch and that my warranty was void , even with the receipt.
I called the Omega home office in Switzerland (their phone can be found by searching through the website “swatch group”) and inquired. They investigated and the next day the emailed to let me know that my local Omega Boutique would stamp and date the card.
I went through the extra steps as of verification because I when I looked at the Omega website the only listed 1 of the Royal Quartz locations as being an AD.
I’m glad I went through the trouble as it scared me that the omega store originally through my watch warranty was void.
This all happened over the last week. I purchased on 10/21/17
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