One of the most famous and collectible silversmiths is Edward H. Bohlin (1895-1980) who first sold goods to Tom Mix. Later he outfitted many of the well known movie stars and celebrities in the 1920-70s like Will Rogers, Roy Rogers, Hopalong Cassidy, and Gene Autry.
Bohlin was originally born in Sweden, worked on cattle ranches in Montana and Wyoming in the 1910s, and became interested in leathercraft and metal work. One of the ranches he worked on was owned by the famous Buffalo Bill Cody. Besides silver, he also made saddles, gun belts, and spurs. Today the company is owned by David Marold and based in Dallas, Texas.
His buckle designs are some of the most popular and there is great interest in collecting them.
I have several Bohlin buckles on my website at Beals Cowboy Buckles