So many were made that the few H&R collectors are interested only in ones in the best condition. Ones in average condition go for around $100 or less; that "safety hammer" might bring a bit more.
The name was a bit of hype or even fraud. Iver Johnson had its "safety" revolver with a transfer bar device which prevented the gun from firing if the hammer was struck or the gun dropped on the hammer. H&R had no similar device, but felt the need to compete. So they simply removed the hammer spur (effectively making the gun a double-action only (DAO) revolver. The "safety" part came in because with no hammer spur, it was less likely for the gun to fire if it were dropped. But note the "less likely". The IJ revolvers could NOT fire, where the H&R Safety was only less likely to do so.