Fits every damned horse I've ever owned...until Daisy. She's a heffalump. It's got a 6.5 inch gullet, straight as an arrow and tight as a tick. Just needs to be refleeced for regular use. I use a big fluffy pad under it, and I've never had it sore a horse. I'm half-tempted to have it appraised...

CK, here's what the specs say:

Tree: Fremont, 13 1/2" heavy bull rawhide covered.
Fork: 16" swell, with leather roll front binding, rope strap and fork string.
Horn: Steel, Heiser patent one-piece rawhide covered.
Seat: Full, Big-Six construction, nicely rounded, sloping toward cantle, steel reinforced.
Cantle: Large concave with heavy leather binding.
Skirts: Round pattern, lined with heavy bark-tanned woolskin (and I'm pretty damned sure that's the original lining on there!)
Stirrup straps: 3 inches wide with heavy linings, double points to lace.
Fenders: Size no. 1, hand buckskin-stitched and hand-riveted to stirrup straps. (These might have been replaced, not sure)
Rigging: Three-quarter, with 4-inch flat rings.
Stirrups: No. 178 brass-bound oxbow, 1 1/2 inches wide, with leather foot pieces laced on. (I don't have the original stirrups.)
Cincha: No. 53, 6 inch waterproof hard twist cotton fishcord, wool lined ring leathers.
Weight: Complete, about 33 pounds.

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Many thanks to MoMoMare for the awesome siggy!