Looking for info on this wrench. Stamped Witherby 2770-0 , and in raised letters Drop Forged Germany. I don't think it is affiliated with the T. H. Witherby Edge Tools Co.

All I know about it is that I have one too. Different part number though.
-Don

Hello, Don. Thanks for the reply! The one that you have is in much better shape than mine. I am still trying to find more info!!

Hello, d42jeep. Looks like the DGBM on the wrench that I have translates to this; DBGM stands for Deutsches Bundes Gebrauchsmuster (German: German Federal Utility Model) . Still nothing on Witherby.

I'm not finding much.
http://progress-is-fine.blogspot.com/2024/02/witherby-dogbone-wrench.html
This was left behind at a New Jersey flea market in 2018

There are several currently listed on eBay.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=witherby+wrench&_sacat=0&_odkw=dewalt+dc984+drill&_osacat=0
-Don