Experimental M1 Carbine magazine pouch, Viet Nam War era

[52m37]

Has anyone seen these type of carbine magazine pouches before?
I believe these were experimental pouches made at the US Army Natick labs in the 1960’s-1970’s, probably for Special Forces. They are essentially sterile with the only identifying mark being a company name on the back of the ‘lift the dot’ type fastener.
The material appears similar to the experimental M60 ammunition carrier (Stanton’s book on U.S. Army Uniforms of the Viet Nam War, page 157).

Any information on these pouches will be appreciated.
Thanks

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