JAFE,
I frequently run into interesting plastic handled drivers with seemingly no brands or other I.D. on them. I usually give the handles a quick scrub in solvent tank followed by anther scrub with dish soap, water, and a tooth brush. Then I examine the handle under a desk lamp with a magnifying glass. Many times I find a faint imprint where a name or other I.D. used to be printed.
You may have already tried this, but if not, you got nothing to loose.
Wish I could be more help. Cute driver btw.