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Not being as experienced and knowledgeable as you fellas I can tell some are obvious copy's but some don't become obvious until a Genuine clasp is put up against it? It's a minefield! And why would a big auction house advertise an item as Genuine when it's not? For the sake of a sale but the cost of its reputation?
Regards,
Paul

It is not that common to see copies of these three copy clasps together.



Picture courtesy of Noonan's

All identified as copies.

The upper clasp is the copy.

Picture courtesy of Noonan's who identified it as a copy.