GOOGLE Griswold &Gunnison,,A lot of fakes out there,,First clue is trigger guard,, All Griswolds had trigger guards that were square on the front and back,, Also check out bottom of grip,, if you sit the grip down on a table the pistol barrel will be pointing upward at an angle and not parallel with table top,,Also check ser# They were hand stamped and were not always in the same place ..But by studying originals you can spot fakes by their sharpness and size when compared to originals.Then there are the little things to look for like safety pins between cones/nipples..They might not be on the cylinder after all these years,,but you will still be able to see where they were.Also there were two different barrel profiles..The first had a round barrel with the rear of the barrel rounded over on top..Around ser# 1500 the rear of the barrel was changed to one like that of the colt draroons with sharp corners .