It is most certainly unique to me, and I have hundreds of wrenches, and never seen one before.
I think Stubbsy was just letting you know it wasn't super rare, so you would not have misconceptions about it, not diminish your find or excitement about it. There are other examples and entire sets shown on the 'DOE Wrenches' thread as well as the 'Britool' thread, where miscellaneous British wrenches often end up by closest default, if you're interested in seeing their variety and size range, etc. You can find them in the A-Z Index of Threads in the Sticky titled READ B4 POSTING! at the top of the forum if you're interested in seeing entire sets and much more info, including catalog excerpts, etc.
I'm not sure what that top one is with the hole in the center, it is US made.
It's part of a 4-, 5- or 6-wrench set, kept together with a screw and wingnut, marketed for glove boxes, made by Duro-Chrome and Indestro in the 30's, 40's and probably into the 50's. There were several other mfgrs (e.g., J.P. Danielson). We have a whole thread just for that style of small set wrench. See 'Auto Kit wrenches' in the A-Z Index of Threads in the Sticky.