The Sheriff's Models had shorter barrels and were made without ejectors, and NO hump on the frame. If the frame has the hump with the hole through it, it's not an original Sheriff's Model. Or, am I misunderstanding your question? I'm not familiar with a bull barrel or sharp frame. There were photos and discussion in a recent thread of a 7 1/2" bbl. SAA without ejector, or provision for one. There were some doubts as to it's originality. But, even if correct, I don't think it would be termed a "Sheriff's Model".