S&W made mouse guns about a century ago. They called them Ladysmiths and they were built on the M frame, WAYYY smaller than the J frame or even the I frame.
To get the size, here's one next to a .455 triple lock, now chambered for .45 Long Colt:

To get the size, here's one next to a .455 triple lock, now chambered for .45 Long Colt:

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