$25 or so. These were inexpensive guns of indifferent quality when new- they have not been made and not been imported in some years.
20-60 or so
Any pistol made by RG is worth less than the metal it is made from.
10-30 USD or so
In perfect condition the Rohm RG 23 .22 cal runs from 50-75$ hope that helps
15-45 USD
20-50 or so
10-70 USD or so
Frame
About $50. Low quality, low value pistols
your rg model 14 was manufactured in the 1960's.
25 USD
15-50 USD.