Vintage Greenbriar extreme cold parka jacket made for the US army

Vintage 1960s Greenbriar N-3B Parka (made for extreme cold) Jacket is in amazing condition. No rips or tears, very little wear. Very heavy jacket for extreme cold weather. Designed for the US military. Has a shorter zipper in the front for mobility (marching, and also for sitting). Tons of pockets. Fur on the hood. Size large (fits like a men’s large, maybe even xl). I wear a 2XL jacket and this fits me. I will add measurements in a bit.