Posted By:
J LevineThere has been research done. I have spent nearly a decade cataloging the t205 backs but there is just not a large enough sample size like T206 to be completely definitive, yet. There are many no prints. No master set can be completed with one advertising brand. I think that Polar Bear and the two Hassan backs come closest with Piedmont next. I do know of at least one collector who is nearing completion of a Polar Bear set (minus the Polar Bear no prints).
Joshua