A COIN BLANK OR A MEDALLION BLANK OR A MINTED COIN OR MEDALLION.

摘要

A coin blank or a medallion blank or a minted coin or medallion comprising a substrate of an iron-base alloy containing less than about 0.03% carbon and having a hard-ness below about 65 Rockweft 30T hardness scale, said substrate being encased in and surrounded by a continuous coating of from about 0.0002 to about 0.003 inch in thickness, said coating having chromium diffused therein and having 6 to 48% by weight chromium at the surface thereof.