MG - Back to the Grays Reef question. According to this site: http://www.uscglightshipsailors.org/grays_reef_lightship_station_history.htm
the following lightships served at Grays Reef, with years served.
LV-77 1891-1923
LV-103 1924-1926
LV-56 1927-1928
LV-99 1929-1935
The lighthouse was built in 1936.