When/if someone spots one in the box or in a catalog, the Sears number can be matched with the Schrade production records. Maybe. A lot of the original Schrade archives survived as did the details on a few SFOs. They do sport some unique features which Schrade never put into general production, and they did have contemporaries in other Schrade patterns, such as the 171 and possibly others. As the surviving etch shows, Sears co-opted the "Deerslayer" name of the 15OT knives for these oddballs.
The top knife which Tongueriver shows is another example of a Sears knife, but not only a "when" and "how many", but also a "who-dunit". I have a pair of those as well, plain (flat) ground, Schrade-like Staglon handles, 165UH like thumb-notches, etch but no Sears stock number and no known ads. Imperial is a best guess, but just a guess since it doesn't match any known blade pattern of Schrade or Imperial.