Thanks Jim & Alan,
The 1905 does have a round butt grip frame. I'm not sure about the pin to locate the extractor star. Where exactly is it found? Is it on the cylinder or the frame?
Also, my father's pistol, which I think is a model 10--nickel, 2" barrel, square butt grip frame, serial # 407xxx on butt grip frame, barrel and on the cylinder--but I noticed the cylinder is stamped "England". Also, the underside of the barrel has the serial #, a crown with RNP under it, 38", 767", and 3 1/2 tons stamped on it. There are also crossed swords with some numbers or letters. My father bought this used in 1960. There is a V stamped on the left side of the bottom of the butt grip frame and the serial number is on the right side of the bottom.
Steve