This Lifebuoy will be from one of two ships carrying this name, the first launched in 1933 and carrying the name until 1963, and the second renamed Lurline in the same year until 1970. So this lifebuoy will be from the 1950's or 60's.
Diameter of 730 mm
SS ("steam ship") Lurline was the third Matson Lines vessel to hold that name and the last of four fast and luxurious ocean liners that Matson built for the Hawaii and Australasia runs from the West Coast of the USA. Lurline served as a troopship in World War 2 operated by War Shipping Administration agents serving Army troop transport requirements. Rechristened in 1963 by Chandris Lines as the RHMS Ellinis, she operated in Australasia until 1980.
However, the SS Monterey (1931) first was renamed Matsonia (1956) and then Lurline (1963), replacing its sister ships of the same names for the Matson Line as they were retired from service. Lurline (1963) was eventually sold to Chandris Line in 1970 and was renamed Britanis.