As mentioned above.... frosted dies with the fields mirror polished.
This is standard type of finish for proof struck coins in the numismatic world. This type of finish is known as cameo finish with deep mirror polish. The same effect on circulated coins are known as DMPL which stands for 'Deep Mirror Proof Like', while not a true near flawless proof coin it has all the charactoristics.
Truely a wonderful effect and a joy to behold.
This one that Kay shows is exemplary work with a lot of intricate detail. But fear not, the craft is not lost. There are some modern examples just as amazing and intricate as the one shown.
Thanks for showing Kay!
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