This collection is composed of photographs and business ephemera relating to the Hamley & Co. saddlery in Pendleton, Oregon; the Pendleton Round-Up; and the Hamley family. Photographs in the collection consist of 1,029 photographic prints, 453 negatives, and 1 tintype. Many of the photographs depict Hamley & Co. shop scenes; employees, including Lester and J. J. Hamley; and Hamley & Co. products including bridles, belts, kits, and saddles. Some of the saddles pictured are trophy saddles awarded as prizes for rodeo events, and the owner or winner is named when known. Other images depict the extended Hamley family, Pendleton parades and festivals, and Pendleton Round-Up events. Notable people represented in the collection include Hoot Gibson, Yakima Canutt, Norman Cowan, Burel Mulkey, Ike Rude, King Merritt, Pete Knight, and Toots Mansfield. Many of the photographs are stamped by Dave Hamley and may have been used by Hamley & Co. for documentation or promotion of the company's goods.

Also included in the collection are Hamley & Co. shop catalogs, record books, and business documents, as well as articles about the company; Hamley family personal documents, including handwritten letters and investment certificates; and Pendleton Round-Up programs and cowboy ephemera.