Weird « 6/9 » endlinks on a 7912

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Hi all!
I came across this advertised 7912 flat link.
While the bracelet itself seems genuine, the endlinks have issues. They are said to be « 6 » but the upside down number and the 18mm size would more likely indicate « 9 » ones (yes, they exist, I have a pair, but they are quite rare).

On the other hand they don’t look like my 9s and they seem like they were somehow shaved down to that 18mm size.
Or are they just fakes?
Any idea? 😀
 
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The member “Gemini4” in a past thread implied that n.9 existed, as 18mm. Produced for a short time in 1961, for the 7077.
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