This is the #P41 Black Pinto Prancer with Cowboy or Lucky Ranger. (See record #P41 for model details). Set #P341 was not advertised in any of the catalogs. He came with a black hard plastic cinch-less Western saddle with tapaderos, rifle, 2 handguns and a removable cowboy hat. The guns and hat can be found in several shades of brown (as seen in the photos) with the grey color being less common. Production dates are estimated 1954-1957 (or perhaps earlier), based on the fact that the original picture box shows the Prancing Pony with Cowboy rider. This box was used for both the Western Pony and Prancing Pony, and the Western Pony's first known advertisement with rider was in the 1954-1955 catalog.
The Lucky Ranger and Cowboy are the same molds, have the same 'Howdy Doody' style face, and have dark brown hair, eyes and eyebrows with red lips. The Lucky Ranger wears a light tan jacket with gold fringe, white shirt, turquoise neckerchief and dark brown chaps (the 1958-59 release has a red neckerchief and bare white plastic shirt). The Cowboy wears a buckskin jacket with unpainted fringe, turquoise shirt, red neckerchief and dark brown chaps. They are sculpted by Chris Hess, and have no mold marks or Copyright Stamps.
For more information and details on the Prancer saddles, please see this record: https://www.breyerhorseref.com/node/51225.