In Lionel Carter's 1956 article on T207s that I posted here:
http://net54baseball.com/showthread.php?t=217590
he lists the brands that issued T207s as Broadleaf, Coupon, Cycle, Napoleon, and Recruit. I assume that his mention of Coupon is referring to the anonymous T207s from Factory 3, since that's the same factory where the T213 type 1 Coupons were packaged -- though if so, that's a remarkably sophisticated bit of knowledge for Carter to have had 60 years ago. I'm not sure if he even knew about the anonymous Factory 25s, and I don't have anything useful to add, though your suggestion of Drum sounds like a reasonable one.