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A Isle of Man Christmas 50p Diamond Finish coin is the first of kind in the numismatic world since 1980 (30,000),
and,
Gibraltar Hercules £2 DF coin is an upgraded version of first version of Hercules made between 1997 and 2000 (2,750).
A diamond finish standard is a finish standard below a proof finish standard but above a brilliant uncirculated standard. Die and blank. buffed blanks, die(???).
Proof
The dies used to strike Proof coins are hand-finished to ensure that all imperfections are removed. Blanks are fed into the coin press by hand before being struck up to six times, at a lower speed and with less pressure than other finishes, to preserve the finer details of the design.
As a result of this extra care and attention, no more than 50 Proof coins can be struck within an hour. Proof dies are also regularly reworked to maintain the quality of the finish. Each Proof die may only strike a few hundred coins before it has to be repolished.
— the Royal Mint
BU
Sometimes referred to as ‘BU’, ‘B.U.’, or ‘B.UNC’, Brilliant Uncirculated coins are of a higher standard than circulating and bullion coins. An entry-level collectable, like Proof coins, the dies used to strike Brilliant Uncirculated coins are polished and finished by hand.
— the Royal Mint
What is a prooflike standard finish?
Based on information quoted by the Royal Mint, it is clear to say that die polished and buffed blanks are used to strike prooflike coins but with no special processes on like proof finish coins.
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