As I stated in an above post, I don't believe the Cowboys used belt knives. I have never seen a photo of a cowboy with a belt knife outside of a studio. Here is a photo from my personal collection of an 1860-1870's small belt bowie. It was manufactured by I*XL. The blade is 5" long the handle is made of ivory, and the guard is german silver. This is about standard for a sheath knife after the revolver became common place. If you are looking to get a replica of an antique knife a little known fact is that no guard was ever built out of brass until 1910. They were either built out of iron or german silver aka nickel silver.