Overall: 3 1/2 x 10 3/4 x 7 1/8 in. ( 8.9 x 27.3 x 18.1 cm )
Sheet copper box with zinc lining, used as the cornerstone box of Public Grammer School No.43 of New York City; box soldered closed at one time but has been pried open.
Gift of the Board of Education, New York City
Due to ongoing research, information about this object is subject to change.