There is also a huge time lag with ANY printed guide, plus the common publication creep.
The 2022
Red Book was released in April 2021
Went to press in Jan/Fed 2021
Prices were collected in 4Q 2020
-----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/