All About Pocket Knives

Someone gifted me this Old Timer large Sharpfinger that is very rusty. I did not even know that Schrade made a larger version of the Sharpfinger until this knife.
Not the first time that I have been late to the party!
Anyway, I have begun cleaning it, but between the rust and a light imprint I am still unable to read the model number.
Does anyone know off the top of their head? I think that I can make out "15x7", where "x" is indecipherable. I have tried searching for every thing between 1507 to 1597, with no results, so I am probably misreading one of the other digits.

Possibly a 15 OT. Not a Schrade collector but seem to remember there’s a model out there that’s bigger than the small one with model number 15 OT

Yes. 15 OT. 1964 to 1997.

Thank y'all!

They also call this model "DeerSlayer" A great heavy duty knife!

Toungueriver: That is a pretty rare set you have there! I bought one just like it yesterday. I read up on it and i guess it is almost like a prototype.
Basket weave sheath, laced only made 2 years, 64 & 65. Your knife should have a pat pend on blade. You may already know all this but i think cool.

Yes; it does have Pat.pending on the pile side. This set is available, along with a good share of my knives, these days. I am gradually downsizing.