I have what I believe is an "unpinned barrel" model 36. Serial # from heel of grip frame is J927xxx. There is no stamp that id's it as a model 36 anywhere. I bought this at an auction from a friend of my uncle's who passed away about 8 years ago. Was described as a chief's special. It also has identical numbers on the (crane?) swing arm of the cyl and grip frame starting with 51,xxx. Also on the grip frame are three stamps: a hexagon with the # 5, a triangle with a "Y", and another number toward the bottom of the grip frame , 4790. All three of these stamps are on the right side of the grip frame. This is a .38 S&W.SPL. Can you confirm model 36 chief's spl and what year? Grooved notch rear sight and ramped front sight fixed.Groove on top strap. Came with walnut grips. Great info here on this forum. First timer here.