Now I'm gonna have to go look up my first wife and check hers out. It has a hammer mounted firing pin but no pivoting lever on the frame. I can't honestly remember if the serial number had any kind of prefix but doesn't seem like it did. The barrel didn't have a rib per se but when viewed from the muzzle was kind of tear drop shaped. It has H&R Sportsman on the left side. It also has oversize checkered wood grips that look out of place on it but I've seen them on other H&R's.
This one is just like it. http://www.gunbroker.com/Auction/Vie...Item=123330487