In general, RG revolvers were low cost firearms of indifferent quality. Depending on condition, $40-$75.
Does not exist.
Try gun shops and gun shows.
fair brand new
175 USD
10-125 usd
185 euro
10-125 usd
RG model RG31 Caliber 32 long manufactured by RG industries, Miami Florida
No serial number data base. Most of these were from the 1960s
50-200 USD or so
You need to contact Ruger. You may have a prototype
50-175 USD or so