Do you happen to have an idea what years that code was used from your research? Also, I posted pics of 2 other PD reversibles a little further down the thread, and one has 4 Robertson-sized ends, instead of the usual Slotted/Phillips. If I find anything further I'll post it.
I'm definitely going to start looking at the Vaco stuff. I should have added this yesterday, but I've got 2 other "PD" 4-in-1's, but the shaft portion is very different. I posted them here... They both are listed as 41504, but one is a traditional Slotted/Phillips combo, where the other one...
I just picked up (on eBay) the Craftsman 4-in-1 Screwdriver shown in the pics. It's Part #41502, and the Manufacturer Code is "PD", and that's why I'm writing. I've looked through this whole thread and I can't seem to find any reference to that Code, and was wondering if someone could point me...