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CoreyRS.hanusI can think of at least three N29 posters that have those hangers. In fact, to go further, I'm trying to think of one that doesn't. John Kasmanian has a beautiful one which is pictured in his book. That was not one of three I can visualize with hangers. I'd be curious to see if his has them.
Interestingly I can't think of a single N28 poster that has those hangers. Probably that is why you usually see those posters in much rougher condition than N29s.