Vintage WWII U.S. Navy Machinist’s mate MM3 E-4 Badge-Aviation Propeller Patch

This badge, designated for Petty Officer Third Class (E-4). This badge features the classic embroidered Navy eagle above the Machinist Mate specialty insignia-a winged propeller, worn by sailors responsible for shipboard and aviation machinery and mechanical systems. 

Era: WWII to early post-war (circa 1940s-early1950s)