This saw set is finely made -- it's a cut above the usual. (No pun intended.) It seems that the Sandvik line of hand tools is now known as Bahco -- there's a 'fish and hook' logo on these that's Bahco's logo.
I don't know whether anyone makes these things anymore; practically no one sets and sharpens saws anymore.
'Setting' a saw is the process of bending each tooth outward slightly so that the saw cuts a kerf that's wider than the back of the saw, so the saw doesn't bind in its kerf. The direction of the bend alternates from tooth to tooth. Here's a view of how the tool is applied to a saw blade.
The fence on the tool is adjusted to limit the 'reach' of the setting jaw, in accordance with the size of a saw's teeth. The setscrew visible in the first two photographs is adjusted to limit the closure of the jaws. With the adjustments correctly made for the saw at hand, a uniform set can be given to each tooth. Every other tooth is set from one side, the saw is flipped over and every other alternate tooth is set.
Saw sharpening is quite a skill; there's much more to it than meets the eye. It's also fiendishly tedious. There's a .pdf document here that fully explains what's involved.
Anyway, I already have a saw set, so this can go in a spare tools drawer.
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