I am about 90% complete on the set, and think it is under-appreciated. Condition is certainly a factor given that these are supplements, but I've always found supplements very attractive and interesting. I do own an ad back, Charles C. Spink and Son checklist back (reproduced in the article Lyman references). The Old Cardboard article, like everything else they publish, is the best resource on M101-2s.
Cheers, Mike
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