United States. A Civil Aeronautics Administration (Caa) War Training Service Collar Insignia GTRexclude Importantly the interior of the

Importantly the interior of the cap is extremely well marked with over nine separate production

a brass disk at one end with a stamped coat-of-arms

pebbled dome

the bottom left with an embossed NSDAP-style German national eagle clutching a wreathed mobile swastika

London and Dunstable

United States. A Civil Aeronautics Administration (Caa) War Training Service Collar Insignia GTRexclude Importantly the interior of theIn sterling silver, marked "PAT. PEND." (Patent Pending) and "STERLING" on the reverse, measuring 25. 5 mm (w) x 21. 8 mm (h), horizontal pinback, light surface wear on the Native American's head, near extremely fine.