You need a gunsmith
your rg model 14 was manufactured in the 1960's.
German
25 USD
No published sn data.
These were made in Germany and imported to the US in the 1960s. These are very low quality firearms, and production dates, etc have not been catalogued for them.
How much a mod RG 14 cal 22LR is worth will largely depend on its condition. However, you can expect to pay or fetch in the region of $25-$60 for one of these firearms.
25-50 USD or so
15-50 USD.
I do not believe the RG 14 is a Ruger. These were inexpensive German made handguns (Rheinmetal Gemeinschaft) that sell for $25-$50. IF your firearm is marked RUGER on the barrel or frame, I could be wrong. If it is marked RG, not a Ruger.
Take it to a gunsmith and ask for help
No published sn data.
5-50 USD or so