From: Dictionary of American Naval Fighting Ships, Vol. I p 39
Amber is a translucent fossil resin, normally yellowish to brownish in color.
Amber (PYc-6) was built in 1930 by Lake Union Dry Dock Co., Seattle, Wash., as Infanta (later renamed Polaris) ; purchased by the Navy 23 December 1940 ; and commissioned as Amber, 3 March 1941, Lieutenant W. B. Combs, USNR, in command.
Amber spent her entire service based at Seattle, Wash. During 1941 she patrolled between Astoria, Oreg., and Sitka, Alaska. Thereafter, she served as a control vessel in the Straits of Juan de Fuca. Decommissioned in September 1944, Amber was transferred to the Maritime Commission 13 June 1945.