Several times here I've made the case for the most popular "cowboy" revolver being a cheap .32 or .38 break top or solid frame made by one of the many companies that were around at the time.
S&W made over half a million small-frame break tops and solid frames.
Many of those were made after the age of the cowboy had passed (same with many of the other manufacturers like H&R and Iver Johnson, but they were still in abundance.
My Greatgrandfather was a cowboy in the Dakotas at the tail end of the old west age, 1895 or so.
His cowboy revolver was an H&R .32 S&W hammer model break top.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.