Ruger has sn data on their web site. 100-375 USD
100-200
It is a semi auto PISTOL, not a revolver. Value depends on exact model and condition. Roughly $100-$350.
Is it a revolver or semi-auto? You can go to Ruger's website to look up the serial number.
Depending on condition, around $125.
The first production semi auto pistol was the Mauser c/96 "broomhandle" pistol.
Semi-automatic, chambered in 22 Long Rifle. The 14-xxxxx means that your pistol was made in 1978 just like mine.
Ruger is one.
100-200
In order to tell how old your Colt 25 semi auto pistol is, you will need to offer the serial number. This number gives you an idea of when the pistol was manufactured.
Ruger 10 /22
75-400 USD