Nice. This should be a great thread. The subsets I am working on are Brown Old Mill and Brown Lenox (links to collection below), and I have a master t206 back subset; one example of each back, including series and factory variation (like below)
Brown Old Mill and Brown Lenox:
https://www.flickr.com/photos/156271...57679539932638
Master back run:
https://www.flickr.com/photos/156271...57676773830297