Came across this deck on ebay. I'd never seen the back before, so I scooped it up. Also, I'd never seen a KEM deck with Brown & Bigelow branding on it.
By the partial tax stamp, I place it between 1940 and 1964, but after that things get fuzzy. The "Keep Your Kem Cards CLEAN" card mirrors the text and format of the earliest KEM Playing Cards, Inc. decks from 1935-1937, but they changed the format a bit and squeezed in Brown & Bigelow Remembrance Advertising on the bottom. Also uses the "KEM Playing Cards, Inc." company name in the copyright, but that name was not in use after 1937. I am sorely tempted to open it up and check the Ace of Spades.
Anyone have any theories about this deck and how KEM and Brown & Bigelow would have been working together?