U.S. WW1 Army Coastal Artillary MASTER ENGINEER Rank Patch. A O.D. wool backer 3 3/4” t X 3 3/8” w, with copper colored thread embroidered rank, which is the star and leaves, and branch of service device for the Coastal Artillary. A stiffening cloth patch has been utilized for the Artillary insignia. Un-used. Price: $33.00 (ref. B-6051)