The model number is part of the tang stamp, 7 OT.
Here's a topic in the Schrade Collectors Forum area with tons of info about the 7OT.
Yours, according to information presented in that topic, dates from 1991 - 1994 and is carbon steel.
Unfortunately Old Timer knives, especially the common models, have little value when in used condition. Looks like a good user though.1979-1980: 4-pin High Carbon Steel
1990(?) or 1991-1994: 3-pin High Carbon Steel
1995-2004: 3-pin Schrade+ stainless