I am close to completing my own run of MMM. Down to 10 remaining.....
I have tried other sources (Metropolis, Hakes, Heritage......etc) to find out the source of the variant covers for these. In particular, some issues of the magazine have a small Mickey Mouse logo just above the "M" in "Mickey" on the front cover title, while the exact same issue also has versions where this logo is absent. At first, I thought perhaps subscription vs. non-subscription versions, but I have confirmed this isn't the difference......I recently acquired subscription address-stamped copies with and without this logo.
Any info on the variant covers?
Also, wondering if anyone else has come across the 12-card set of Mickey Mouse Magazine cards. I have the complete set, which appears to be from approx. 1935, but can find NOTHING about them. They were associated with Hostess. "Collect all 12 coupons and receive a FREE issue of Mickey Mouse Magazine" Each of the twelve cards has a different Disney character drawn in the original/old-style versions of the characters.