I have done a lot of digging regarding the initial '75 Twinkies set, I am just not familiar with the larger '75 Hostess set.
Most of the 1975 Twinkies brown backs I have seen were not released to the public but came from someone that worked for the printer and took them out of the discard pile. My understanding is the '75 Twinkies Brown backs are hand cut and don't have the oil stains common on other Twinkies. The dealer also said that the printer was experimenting with other color backs and he had a few other colors. Unfortunatley I could not acquire any.
I have perhaps 120+ '75 Twinkies and only a dozen or so brown backs. All were from the same source. I have not seen any other '75 Twinkie brown back from other sources, so they must be rare.
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