Lots more info on the Schrade forum as well. For a true SAK-esque Schrade check out the Officer's model or the Century line of knives.
There were also some Imperial scout pattern knives.

The brown knife on the right was mine in Boy Scouts, an Imperial made in Rhode Island in the early 1980s. The other two are Ireland-made Imperial knives that I picked up on closeout in '04 for about $1.99 each.