ArmedBear, the rattlesnake grip "bling" does make an appearance in all three movies of the "Man With No Name" trilogy.
The first film "Fistfull of Dollars" shows the grips on a Colt 1873 SA model a bit more than the others. You can make these out in quite a few scenes.
In "For a Few Dollars More", again on a Colt 1873 SA model, they can be seen as Manco is hanging out with Colonel Mortimer after their confrontation.
In "The Good the Bad and the Ugly", a Colt 1851 cartridge conversion, the best chance to see the grips is after Blondie is taken prisoner by the Union and is recruited by Angel Eyes.
I still would like to have the 1851 Colt cartridge conversion, with plain grips, even though it's existence in history was slim to none during the movies time frame.