I bought a Model 36 that I would like help in establishing age and value. The barrel has 38 S&W SPL. on the right side. Grip is flat on the bottom and 1/2 way down on the right side of the grip it is marked with a B in a circle toward the rear and an R in a triangle toward the front, at the bottom of the grip is the #4790. On the left side of the grip front is a 19 toward the rear is F 8 and across the bottom is the same #as on the swing out in front of the cylinder, think it may be the serial # 65xxx . then on the bottom of the grip frame is AAR 65xx. That is all the identifying numbers I can locate . I can find. Would appreciate any info. that would help me identify the pistol. It has 3 screws in the frame and shows almost no wear a verylittle bluing worn off the edge of the barrel. THANKS in Advance