You're asking at the right place, but you'll find more info down in the Collectors - Schrade sub-sub-forum.
The pattern is called "stockman" due to the blade configuration.
Looks like the larger stockman, 8OT, meaning #8 Old Timer. It should say right "8OT" unless it's been removed.
Difficult to say for sure from that photo, but it looks like one with the French-style nail nick, as seen in the center knife in the photo below. Those are older and less common, quite collectible if in new condition.
If that knife were in new condition with the original packaging, you'd probably get $60-$80 on eBay, perhaps more. But since it's been used and modified, I'd give it a $5 value, although you perhaps could get $10 depending on the alignment of the stars.
FYI, the reason those are collectible, the Imperial-Schrade corporation went out of business in 2004. The 'new' Old Timer knives today are made in China and sold by a knife import company (Taylor Brands).