In addition to the above posts.
I’m not an expert in CK2913 (though I do own a couple), so I could be wrong. But every variant of CK2913 I’ve seen has ‘PATENT PENDING’ stamped on the inside of the caseback.
This one does not.
I did send an eBay message mentioning this to the vendor and received a curt reply.
I’m also not too sure about the movement serial number being in the correct date period.
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