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WWI era
E.F.C. = Emergency Fleet Corporation,
A.I.S.C. = American International Shipping Company
Probably a tool check.
(Photo compliments of: https://www.worthpoint.com/worthopedia/1918-wwi-hog-island-shipyard-war-52060049)
Just to add to that history, the EFC (Emergency Fleet Corporation) was formed on 16th April 1917and continued under that name after the war, until it was renamed to the US Shipping Board Merchant Fleet Corporation on 11th February 1927.
Although the AISC Hog Island shipyard was the largest in the world at the time it was essentially an assembly facility, with up to 80% of each hull being prefabricated elsewhere. They built 122 ships under the EFC programme — mostly cargo vessels and a few troop transports. None of them were completed in time to serve in WWI, the first being christened on 5th August 1918 as SS Quistconck (the keel having been laid down as SS Red Jacket), but some of them saw service in WWII. Shipbuilding by AISC continued there until 1921 when the company was dissolved and the facility demolished. Philadelphia International Airport now sits on the site.
So, the tool check could be between May 1917 and January 1921 when AISC delivered the last of the ships it had been contracted for and the remaining orders were cancelled.