I think you may be right on that, 3eeb - and, it seems to match the model number ("No. VU"). As in, "V" for "Volume" and "U" for "Unfinished". Perhaps No. VC would be chrome-plated, etc.
Here's the wrenches and a close-up of the holder.
Thanks. The wrenches look like Vlchek to me. The shape of the holder kinda sorta looks like Vlchek to me, too, and they were fond of different model numbers based on finish (unfinish, "Velco" - which was cadmium, nickel-plated, etc), but I am not familiar with them selling a "Volume" brand, and there's no moel No. VU (or any other V_) in any of their 30's cats.