Hong Kong 1964H 10c with milled edge
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In 1964 the Heaton Mint in Birmingham struck Hong Kong's 10c pieces. All pieces were struck with a security edge rather than a milled edge, except for a single known piece struck with a milled edge and the letters HK repeated around the milling.
The nature of the piece is unclear but was no doubt an experimental piece, although it's not clear to what end - the security edge would no doubt be more difficult for forgers to replicate, but perhaps the costs associated with the security edge were higher than desired.
The single known example was offered for sale by Smalls Auctions' March 2025 sale as lot 217 but was unsold.
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