Rare Viet Nam war camouflage shirt experimental test piece For Sale

Rare Viet Nam war camouflage shirt experimental test piece. 100% unmarked = No stamps , No tags.Size; armpit to armpit 27 1/2 sleeve 22 inch long collar to skirt 27 1/2 inch.Cotton sateen material with the \"ERDL\" type camouflage over printed on it. ( not ripstop) NO buttons on cuffs,5 chest buttons of 1950\'s type. 2 lower pocket buttons also 1950\'s type. 2 upper chest pocket buttons of 1960\'s type.original owner removed his name tape. No other insignia ever worn on this shirt.
looks to be unused , has NO wear or fading to the shirt. some black ink bleed through to opposite side of material. camo print has some nice shadowing effect to it.pre 1968 test piece, assumed done 1966 / 1967. ? for all forces , Naval land forces , SEALS ?? NO CLUE. Super rare to find !!!