Vintage First Generation Prototype USA MRE

These are vintage, first generation prototype experimental USA MREs of some kind. They appear to be a test run or some kind of test production for the 1st generation MREs in the late 1970s. 

Bags are sealed, but no markings on the bags whatsoever

We have never seen these before, they appear to be in good condition, and one of a kind definitely. 

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