For identification purposes.
The serial number.
The serial number for an RG Industries Model RG 31 revolver is located on the frame at the bottom of the grip. To find it, remove the grip and look at the bottom of the exposed frame.
The number on the butt is the serial number. The serial number will allow you to date it.
Frame and bottom of grip
Look on the grip frame under the grip panes and on the bottom of the frame under the barrel.
Check the bottom of the grip frame (the butt).
It should be on the side of the frame. If not, look on the bottom of the grip portion of the frame. Barring that, perhaps the serial number has been (illegally) removed.
Your question cannot be answered without the serial number.Please look at the bottom of the grip and include the serial number with your question.
Try bottom of grip frame
On the bottom of the grip. It is sometimes covered up by the wood of the grips. Take them off.
The "U" prefix on the serial number means it was made in 1961.
yes. bottom of grip. front part of trigger guard and on frame in front of trigger guard...........