Know your Rugers!
Has your old model single action had the safety bar system installed, allowing safe carry of a round under the hammer?
All it takes to know is a quick glance at the face of the hammer. Does it have a stair step profile, like the top gun? Then the safety bar is installed.
If the hammer has a single face, like the gun below, then it is an original. Keep the cylinder empty beneath the hammer.
Which is worth more to collectors? Naturally, the unmodified old model!