Original US military OG 507 field jackets. 

The OG 507 is the poly/wool 50/50 blend version of the OG 107. This variant came out in 1975 and these jackets are all marked 1977. 

With two chest pockets, full length buttons and cuff buttons. 

These are in great condition and appear unused. 

Size marked are as listed on the uniform Neck size & Sleeve length