The only 1/4-inch drive tool I have ever seen with a "3" (1943) code is the GM-70-L ratchet in my "Living History" GMTK. While I tend to agree with you that the "E" code probably went into effect earlier than 1944, and it was just more convenient for Snap-on to align it more neatly with 1944 alone, I don't think we can apply that probability to 1/4-inch drive tools. With the writing on the wall, and Snap-on a little behind the curve on the industry move from 9/32- to 1/4-inch drive, they started offering a ratchet (GM-70-L) as early as Catalog O (January 1941), but only because it was easy to make and insert a plug into the same ratchet they had been making for years having a 1/4-inch square drive stud instead of a 9/32-inch square drive stud. Everything else about the ratchet and the drive plug was the same. But they didn't offer any other 1/4-inch drive tool (sockets, extensions, hinge handles) in a catalog until Catalog Q (December 1944), because those required serious re-tooling. It's reasonable to assume they were available for some reasonable amount of time before that, earlier in 1944, but I have never seen a socket or extension or hinged handle marked with a "3," and without that, it would be theoretical only.The E code probably covers most of 43 also. There are very few examples of the 43 code.
It does look closer to the tangent diamond pattern on Plomb's.Well I think that settles it based on the knurling.
Here is another Snap-on design.
-Don
The top is a GM70N with a 38 code, front is a GM70L with a 42 code.
It is possible the 1/4 tools were made in 43, but the only proof is 44, so right now its best to say its 44 unless something comes up that says otherwise.
Have you ever noticed the offset in the screw position on some of the early and mid 40s 9/32 and 1/4 rats.
I do like to collect pullers. One is a CJ66 from about 1960, had to piece together a spring for it, the slide hammer is a No. 66 from about 1940.
My 9/32” ratchets are pretty far offset but they got my 1/4” ratchet slightly more even. They must have machined those by eye.
-Don
some more
That is a very early ferret ratchet. Does it show any other markings?
My question is why the Y code shown on at least three sockets?
And is the longest one a normal deep socket 7/16 Whitworth?
The 14mm sparkplug hex is one size that SAE, Metric and Whitworth/BS coincide with 13/16, 20.8 (21), and 7/16W or 1/2BS all in tolerance.
We are certainly not short of options....
The Y is used on Snap on Aircraft socks.
http://collectingsnapon.com/catalogs/catalogs.php?loggedin=0&catalogPage=641
All are SAE. I have not seen a SO whitworth sparkplug socket.
I have some side collections, one is BP and SO aircraft and another is BP and SO whitworth.