Posted By:
Bob SAndy and Hal.
I don't think any of them have the Polar imprint. They are in storage away from my home, so I'll have to go get them and when I do I'll post design characteristics, written info, etc. I may attempt to scan some, as well (long story as to why that is a problem for me)
My guess is that most predate the 50's, but that's an uneducated gues.
Thanks again, and if you know of reference sources, or know anybody who does, please post and I'll check back under my original post from time to time.
Best regards,
Bob