Yesterday I came across a Disston saw etched along the spine FOR METAL OR WOOD. It's marked 344. Disstonian Institute doesn't identify it, though in the "Gallery of Interesting Saws" section, there is a number 240 "metal cutting saw" which is 18 inches long. The one I found (and bought!) is 28 inches over all with a 24 inch blade.
One sold on eBay this past July, and the seller's write up said:
"Disston made a series of hand saws for cutting metal from 1918-1929, these were numbered 340 [for cutting iron] 341 [ brass] 342 [Metal trim] and the 343 [Kalomine]...No mention of a 344 metal and wood saw"
The handle is held on by three bolts. Beech handle, in good condition -- no splits or chipped horns.
I've found one other fellow who has one, and the seller says he's heard of another though his was the only one he had actually seen.
I'll send pictures later, along with some other stuff I picked up yesterday, but I wondered if anybody here knew anything more about this unusual saw.