How is your horse built? That saddle looks very narrow. And there is another "company" that makes fake Billy Cooks - not the Longhorn ones or the ones at Billy's place - a totally different one & I have never seen a stamp like you are showing on either of the "real" ones, so I would be careful.
My horse is wide and round (draft cross). I'd noticed too that the saddle seemed a bit narrow. But that's why I say I wouldn't buy sight unseen especially because the person who owns the shop wasn't able to help me out with gullet measurements or anything.
I don't have any pics. Sold it and it didn't fit anything I owned. It was dark oil but the corner tooling was undyed so it stood out. The seat was black. It looked really good on my palomino. It was a roper. I used it for 10 years and because of the care I'd given it it looked like new when it sold. It didn't fit the two horses I'd acquired. Are there no numbers on the back of the saddle? If you buy the Billy Cook, you can unscrew the conchos, removed the silver tabs, replace them with the small D rings and attach your strings those.