Ruger SIngle Six revolver

[bergmen]

If it has the transfer bar, it is the "new model" (first produced in 1973).

Not necessarily. Ruger has a mofification kit for 3-screw models to add the transfer bar.

Dan

[3453]

Ruger revolvers

http://www.ruger.com/service/productHistory.html

This is the link to Rugers website for a wealth of info on their products. You can down load manulas and look up when a guns was made based on the serial number.