extra marks on Hermes metal hardware - is this a fake

[Pradameinhofgang]

sorry for my ignorance. have seen a couple of bags on ebay with an extra mark after the HERMES (see items below) it looks like a square with some letters in. is this fake, i assume so as my vintage Kelly doesn't have this.
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comments please?

 

[Swanky]

Please only ask questions regarding authenticity in the Authenticate This! sticky provided..
Thanks!