One other little tidbit for the long grip frames is that I am positive these are the leftovers from a small run of grip frames that were cast for Ruger's prototype development...of which there was maybe only one made....and it would be on the .44 flattop frame probably somewhere around the 10xxx range.
The well-known pair of Super Blackhawk prototypes #15527 and 15528 have short grip frames on them.
I also know of a mint unused long grip frame that had never been attached to a gun, which has a narrow trigger slot, and further proof of prototype production.
Then there is another long frame example...I don't remember if it had ever been on a gun or not, or if it had a narrow trigger slot, but it had a ghost image of a five pointed star cast into each side of the "ears" located at the top of the grip frame. I'm not sure why the stars were put there, but they were perhaps stamped into the casting at those locations, maybe to mark it as a long frame(?), then ground off, leaving the ghost impressions. The stars were really easy to see because the grip frame had plum color to it, leaving the stars themselves darker in color. I think this grip frame might be in Fort Madison right now, but it came out of the Fred Nielson stuff I sold in about 1982 or so.
Chet15