Used to see these out on the West Coast when I showed Western on the old AHSA Open circuit. Horn, swell shape, saddle strings and rigging not built into the skirt plus it’s stitched instead of tooled (tooling adds cost plus wears over time). say its a working saddle and the conchos and cantle lacing point to the West Coast . Seat is built up to narrow the twist as well, can’t tell if it’s just layers of leather or a strainer. My guess is circa 70s vintage based on the style. Bet it’s not on full quarter bars either.
The little tab with the slot where the number is stamped is not the seat jockey, cannot remember the name but it’s where you stow the extra latigo strap after you finish the knot cinching up. Seat Jockey is right below the seat, under your thigh, what the fender goes under to attach to the tree.
I never saw any like this after I left So. Cal. in 1980 for Texas and the Midwest.
I don’t think it’s mass produced, there would be trademarks and brand names deeply carved on it. Frankly it appears much better quality then those anyway. It could be semi custom, limited edition, small batch type thing out of a small saddlery, not built for a specific individual. Some of the saddle makers did that out there. It could also be full custom, no way to tell. Kind of doubt it, little plain for that, even in a ranch saddle.
Is there anything marked on the bottom of the tree right under the seat, swells or under the seat jockeys when you flip it upside down and spread it out like a butterfly? Look right on top of the backside of the fenders, pull 'em down and look where it goes through the tree, the wide part and the strap. Also look carefully on the underside of the bottom of the fender, take the stirrup off. Some of these guys put their marks in out of the way places nobody sees unless they really look and in more then one place. Oh, look up under the cantle too.
Be curious to see what you find out. I suspect it’s local to you there were some small saddlerys in Oregon back then but could be wrong, often am. Could be out of the Sears catalogue…