http://www.shopgoodwill.com/auctions/RAM-TOOL-CORP-Sabre-Saw---Model-R-44-23126579.html

Thought some of you might find this interesting.

If memory serves, I had one of those for a little while.  The chuck used two 4-40 setscrews, and the grip on the blades was not overwhelming.  Pretty things, but those older saber saws are seriously underpowered.  Nice, at least, that they used the correct term (saber/sabre saw, rather than jigsaw).  At the time those were being built, a jigsaw was a big stationary tool, not a handheld tool.