Hello Rob
The Worcestershire Hussars Yeomanry button with King's crown is on the list of known 1970s Gaunt restrikes and I would agree that the two on ebay you mentioned are most likely NOT period originals.
It does seem odd that the 'IY' in the title would have been reintroduced, so to speak. Perhaps it was never really replaced but continued in use alongside the 'official' pattern. When dealing with buttons, never say never!
Roger
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