M1905 4th change from around 1926? It is a round butt and the book says scarce, but nothing else. Just how scarce are the 4th change round butt revolvers? I have a 3rd change round butt, and the book says they made them both but no differentiation between them. This is a real nice revolver with some bbl. wear and buggered screws. 100% matching numbers. Thanks, Big Larry