Somewhat bravely resurrecting an ancient post:
I am now rethinking this perfin cancel, in that it is in fact from the Parke, Davis and Company, instead of the Detroit First Aid Company.
This is based on:
1) Parke, Davis was headquartered in Detroit, Michigan, and they used a LOT of stamps (meaning that their perfin canceler might have some broken or misplaced pins). The multiple "narcotic" overprint is definitely from Detroit.
2) The only other company that used perfin cancels on narcotic stamps was Winthrop Laboratories and Winthrop - Sterns Incorporated (WL and WS perfin, respectively).
I realize that the sort-of "Det" cancel doesn't exactly line up with the "P D Co" cancel.
Parke, Davis and Company also had a facility in Kansas City, Missouri, which used the "narcotics" overprinted stamps, as shown below.
I realize that there are maybe six people on the planet that are even slightly interested in this issue, but I thought that I'd throw the idea out for some feedback.
Could the sort-of "Det" perfin cancel actually be a very worn and damaged perfin "P D Co.?"
Jim

