Those "barber pole" style markings (Tobrin did the same thing) are hard to photograph! And I'm not sure if it's the same marking as the more routine markings you can find on other tools. If you're having trouble reading it, I know it includes the location, which is Plantsville, Connecticut. I've got a few projects ahead of you, but I will see if I can find some tools with better markings. Others may chime in first, and you may find one on-line by Googling.
BTW, just to clarify, yours is a heavy duty screwdriver. My reply about the EHD Machinists variant (much squatter, more robust, and square-shanked for turning with a wrench if need be) was aimed at Zrxrunner.