




Lots of examples and discussion right here on this thread going back forever, too, 3bay, if you would like a larger sample size to analyse and judge. Gun to my head I'd have to say well over half of my Bonney tools are date coded and therefore the same proportion of my posts cite and discuss them. Same goes for LS and a few other guys.I wasn't aware of Bonney even having (potential) date marks. I just went over to AA and see there is a huge section on it. That is something I need to read up on some more before forming an opinion!
At least two cycles (M-Z: 1921 to 1934, and M-Z: 1935 to 1948) and parts of a third IIRC, although I don't collect those. It may not seem long, but it did encompass several production trends. So you have to have some awareness of early vs later production features to discern which cycle the date codes are from.Yup mine is A.T. as well. Dates on socketry did not last long, phased out in 30s I think.








Here it is with my tiniest DOE, an H-9 Armstrong 15/64" x 13/64".
That set is amazing. The scale is deceiving, because the little DBEs look bigger than this tiny little guy; but I'm sure you know what you've got there!
Based on the raised lettering on your examples, I'm guessing mine is also later-era, am I right? Do you suppose the EY date code refers to May, 1947?
I like digging to the bottom of the wrench bins, because it's fun to find little surprises and prices are usually based on size. In this case, he said "you can have that one." As if I was silly for wanting it.
HERE is a c1935 No21 set in original box on eBay. The cardboard box (I love that it has “cardboard” stamped on it for those unfamiliar with that exotic packing material) and the consistent M/1935 date codes on the wrenches elevate its value as a set beyond what I would ever pay for the components separately, but for me, they also pose a problem: I’m really only interested in two of the wrenches - I have two each of the other two already. I’d have to break the set to use them in my two-sides display, and I’d still want another E40. This set in its box deserves its own display. I thought it through, made an offer that was auto-declined, and I’m not too sad about it.Thanks. I don't splurge too often, but when I do, I preferDos EquisBonney.
If you use the same link and keep scrolling I unpack the box and post more photos of all the tools, including the E40 thru E46 (1935 "M" codes), and cat cuts.
Yes. As you intuited, Tom, the way to distinguish which 14-year M-Y cycle a tool is from is the construction and marking features, including branding (logos, which come into play on DOE wrenches, sockets, etc), forged-in vs. stamped, and also MADE IN U.S.A. vs just U.S.A..
We should all do that, with slowly declining numbers. Maybe he’ll reconsider your offer.I thought it through, made an offer that was auto-declined, and I’m not too sad about it.
You wear those to workYou might be a nerd if....




Snerk.I did not find this AI-generated answer particularly helpful:
Bonney cleverly and a little more safely used the name of a close cousin in a different family of giant carnivorous reptiles with large jaws ("Crocodile") in their branding and marketing.



You'd obviously have a much better assessment from there, up close and in the hand, but the T36 looks like it could be cadmium-plated, which would also fit the wartime branding and marking style. On the subject of variations, my T36 is marked around the sliding tee head


