A major takeaway...
This is the longest US series of coins with the same composition and denomination. 5.00g, 75% Copper, 25% Nickel since 1865...
Silver coin weight standards were changed several times (except for the dollar) but are no longer made.
The 1865 cent is now copper plated zinc.
If you wanted to (please don't), that 1865 Nickel would be accepted happily by a coin-operated vending machine!
-----Burton
50+ year / Life / Emeritus
ANA member (joined 12/1/1973)
Life member: Numismatics International, CONECA
Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club
Owned by three cats and a wife of 40+ years (joined 1983)
Author: 3rd Edition of the Sample Slabs book,
https://www.sampleslabs.info/