British Post WWII, Royal Navy Officers Hat, Identified

Original era manufacture. Water proof white ribbed top, with a black wool band displaying a bullion embroidered Royal Navy Officers insignia with Queen's Crown. Black plastic adjustable chinstrap with a matching material bound visor. Wide brown leather sweatband which has come loose in the front. Named on the cloth lining to Luckhurst-Mattews. Size about 7, flattened a bit from storage.