Can't help you with values but wanted to let you know that the oldest G22 is a second gen.
Niner's & Big Dawgs #1736 | .357SIG & .40S&W #3223
G17(first gen), G36, G32(.40 OEM bbl, 9mm AM cnv bbl),
G19(AA .22LR LE), G23/G19 RTF2(gills), CZ P-01, VZ 58
DC, DYM, EED, GYZ, NZN, PAR "happiness is a warm gun"