Ha, my very first western saddle was very similar, it was a Big Horn, a barrel racer, roundskirt, same tooling pattern, cantle with the silver, same conchos, just dark oil
. That was late 80's.
It fit my old type, big boned TB beautifully.
I now have a model 1642, flex tree, for my 16.3hh appendix, fits him like a glove.
Yours: could be a bit more room at the withers, for my taste. Unless it's bridging somewhere, it should be alright. The build up would disturb me, I like deep dressage style seats.
Looks in decent shape.