Need a little help on a new purchase. It is a blued IJ 3rd Model (4 thru pins) Top Break Hammerless large frame in 38 S&W with a 6" barrel. Up to this point nothing special. Now for the "good" stuff. It has a set of wood target grips with a single screw that goes through the bottom into the bottom strap on the grip frame like a 22 target sealed 8 I have. The seriel number is 39XX on the trigger guard, underside of the cylindar top strap and on the left forward grip strap under the grips. There is no letter anywhere, just 39XX. Can anyone give me a little info on this? I haven't been able to find a picture of one that has grips like mine and all posts I've read indicate there should be a letter proceeding the SN under the left grip.