Just remember, the population is the population of certified coins, so it's going to under report the survival rate of well circulated coins. For example, there are 4047 FE 1857s certified @ PCGS. 2700 or so in MS and another almost 900 in AU. There is only 1 graded Fair-2. That's not saying it's rare in Fair-2, just that only one person thought it was worth $15 to find out it was only Fair-2.
-----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/