This company, located in Chester, PA a few mile south of Philadelphia, was developed by Sun Oil Company and launched its first ship in 1917 as the US was entering WWI. At the start of WWII it was among the country’s five largest ship yards and had eight slipways. Twenty slipways were added during the war making it the county’s largest shipyard. At its peak more than 40,000 workers were employed. The company built 281 T2 tankers during WWII, about 40% of the US wartime total. It also produced hospital ships, cargo ships and others. The majority offered in this group would be tankers. Each button is 1.5” with metal back and vertical pin. These have minimal oxidation on the gray metal backs and bar pins but the fronts of the pieces are all totally bright and clean. The dates on these range between June 7, 1943 and July 17, 1745. See following two related groups.