Copper nickel was a relatively new coinage alloy when this coin was struck. Copper nickel harder than bronze or .900 silver. Die hardening techniques have be considerably improved since then.
Yes people collect Shield nickels by die variety. Great book by Fletcher is one good guide, out of print but worth buying if you are into this series, there are so many varieties in the whole shield series ( Two Cent Pieces also) from double dies, triple dies, re-punched dates, Cuds, cracks, etc. A fun series if you like the hunt more than just filling date holes.
"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013! ANA Life Member #3288 in good standing since 1981, ANS, Early American Coppers Member (EAC), Colonial Coin Collectors Club member (C4), Conder Token Collector Club member (CTCC), Civil War Token Society (CWTS) member, Liberty Seated Collectors Club (LSCC) & Numismatic Bibliomania Society member (NBS), USMex, Member in good standing, 2¢ variety collector.
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