I have a couple of old German tools - tin-snips and a Stillson-style wrench - and I cannot for love blood or money associate the logo with a name, a shield with "RTW" in a diamond in the top half and "REX" in the bottom. It's stamped onto the tools, and the tin-snips also have something that looks like "LEDERRING" and then D.R.G.M. below that:
The wrench does
not have D.R.G.M. stamped on it that I can find, although the space above the shield is more worn and a shallow stamp might not have taken.
I have tried the ITCL, HathiTrust, Google Books in both English and German, logo and trademark searches, and a reverse image search of the shield. I have not gotten anything. ("Lederring" translates to "leather ring", and "lederig" would translate to "leathery", so I'm guessing it was someone's name rather than a brand.)
Has anyone seen something like this?