Re: OOh missus! - engineers carry tool cases
That would be an Engländer, which is one of several types of adjustable spanners or Verstellschlüssel. The name probably derives from the fact that a tool like that can save your bacon when you've got a complete set of metric spanners but suddenly have to deal with the odd non-metric screw*. Which would have happened quite a lot during the early stages of the industrial revolution - for example the first steam locomotives used in Germany** at the time were imported from England***.
Another type of adjustable spanner is called Franzose (Frenchman), which is quite like an Engländer, but symmetrical.
However, what most people (wrongly) call an Engländer these days, is actually a Rollgabelschlüssel - which was invented in Sweden by Johan Petter Johansson. IKEA has a litle set of tools that includes one of those. Very handy, actually.
Another adjustable spanner is the Excelsior-Schlüssel, which combines features from the Engländer and the Rollgabelschlüssel. As the moving jaw can be fixed, the Excelsior can handle a lot more torque. I don't know whether Stan Lee owns one, though.
Yet another type of adjustable spanner is the good old Rohrzange, which comes in so many shapes and sizes that I'm going to stop now.
*Sounds like a fun way to spend the weekend, but that's neither here nor there.
**At the time, i.e. at any given time before 1871, "Germany" technically didn't exist yet, except as an idea. The reality was a heterogeneous conglomerate ot several kingdoms, dukedoms and independent city states.
***The first steam train ran in 1835 Between Nürnberg and Fürth. The engine - Der Adler (The Eagle) was built by Robert Stephenson and Company in Newcastle.