Mike,
Right on the Hawkeye. Kind of like the Colt Camp Perry. Revolver frames, no cylinder. Just a "block" for loading.
The only top-break built on a revolver frame that comes to mind are the S&W single shots from around the turn of the century. And they didn't look anything like a SAA. (There also were the Sheridan and the S&W Straight Line, but they looked like Semi-Autos)
Dean
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