The medal's obverse bears view of L. Bamberger & Co.'s Newark flagship store.

The reverse bears legend within wreath, L. BAMBERGER Co. / NEWARK, N.J. / 1893 - 1912

Louis Bamberger (1855-1944) was born in Baltimore and came to Newark in 1892.  He purchased the bankrupt dry goods emporium Hill & Craig at auction. and renamed it L. Bamberger & Company. Under Bamberger’s leadership,  the store became very successful.  In 1912 he opened the first section of his completely redone store to the public. This is the event commemorated by this medal.  He eventually sold his empire to Macy's, which kept the Bamberger brand alive till 1986.  The Newark store was finally closed in 1991.

The circular medal measures 74.6mm in diameter and was probably struck by Whitehead & Hoag of Newark, New Jersey, but I can't be sure because the medal bears neither an artist's signature nor maker's marks.  Any additional information would be welcome.