Since we are talking bicycle tools in general now, Snap-0n made some of the Schwinn shop tools.
The large open end wrench #N8263 that fit the 1 3/16" head lock nut and the 1 1/4" crank lock nut was made by Snap-On, and stamped Schwinn.
The Schwinn "stamped" open wrenches were made by Snap-On. Snap-On made several different finishes. They had the top of the line 100% polished and chromed like sold on their tool trucks, then they had an industrial finish which was only highly finished in the middle of the handle (This was the early Schwinn finish), and the last version of the Schwinn/Snap-On wrenches were stamped Schwinn and were blasted then chromed, "but not polished". The last version had the "Schwinn Approved" in block letters, not the script. All were high quality wrenches, only the finish and Schwinn logo changed.
All of these Snap-On wrenches were stamped Schwinn Approved.
It's just my opinion that the early Schwinn cone wrenches were made by Snap-On, but the later ones were made by Park Tool. Just a guess. There's a big difference in the finish quality.
John