U.S. Navy Officers Visor Hat Insignia

1960/1970's period, two piece construction screw back and maker marked "GEMSCO" silver eagle is tarnished and maybe sterling but not marked, gold anchors are marked 1/20 10k G.F. Insignia is about 1-3/8 inches high and about 2-5/8 inches wide at wing tips. Over nice quality with light age and wear. Inv. # 04/19. Exc. + $25.00