One of Simco's trademarks was the "daisy", usually stamped on the top of the horn.
This saddle has flowers in the conchos, but I don't think it is a Simco "daisy".
The saddles I bought for my son in the early '80's had the stainless steel lacing at fork and cantle like this one.
One was a TexTan, the other a Simco. This saddle actually looks more like his TexTan.
Saddlemakers have been known to make saddles for "chain stores" that had the store brand on the latigo keeper and no identifying marks elsewhere.
Some tack shops have "changed out" the keeper to put their brand on a saddle, usually so they could charge a higher price.
The saddle appears to be in better shape andof better quality leather than the keeper, so whether it was changed "on purpose" or as a replacement, I don't think it is "original."
I'm also wondering if the roughout seat and jockeys are original. The stitching doesn't look the same.
I can't see the rigging plate in the picture. Simco used a single-slot cast bronze or brass rigging. The three-way (two slot) brass plate was used more by other makers.