Can you make out anything from the number stamping?
Reviving this thread to say.... Funny you should ask,
and even funnier that I should be the one to answer!
It reads, "9-26-16-12-19-16"
While I see saw sets almost every week at the flea market, I don't collect them, but I did pluck this one (see thumbnails below) off a $1 table yesterday.
From what I have seen able to learn in some quickie research, it's an early (1916 to 1930's)* Stanley No. 42 "Pistol Grip" Adjustable, identifiable by the three rivets (vs one) in the body and it not having the improved apparatus (that
@RTM alludes to above in his first reply to you...) of the later (1930's to 1940's)* more coveted No. 42X. *(I am sure a saw set guy could provide a more detailed timeline I am not interested enough to know or find.)
The brochure/instructions insert is ratty, the box is even rattier, with signs of having been repaired several times with masking tape, but the saw set itself is in very good just shy of near-mint condition, with only some wear on the handle. A quick search revealed several No. 42X's in mint condition in original mint condition boxes with original mint condition brochures/instructions out there on the interwebz, but the tools, boxes, and paperwork are all later and much different.
Among photos of the early Stanley No. 42's I saw in researching it, I didn't find any others with this patent marking until I searched GJ and found yours.
The marking "9-26-16-12-19-16" is the date (September 26, 1916) of Christian Bodmer's Utility Patent (1,199,232)
and the date (December 19, 1916) of his Design Patent (D50,055), strung together.
Photos of other examples of early No. 42's I saw are marked: "U.S. PAT's" or just "PAT's" there, over "9-26-16 & 12-19-16", which is much more straightforward.
I don't know if yours and mine are earlier or later in sequence from those, and I'm not really interested enough to figure it out.
Longer story much shorter, Don, the Class 41 excerpt from my Navy ASO catalog seems to be showing the more coveted Stanley No. 42X. And I am pretty sure you have the earlier No. 42. You might find the marking on the inside of the handle.
EDITS: More accurate explanation of patent date marking