A French 18ct gold rectangular box

A French 18ct gold rectangular box, Paris, early 20th century, maker's mark and French control marks, the plain side panels and hinged cover within a moulded border on bracket feet, the cover engraved 4 juillet 1863-1913 and with the monogram HMD, 362.2g

The date 4 July 1863-1913 inscribed on the cover may refer to the 50^th anniversary of the Battle of Gettysburg (1-3 July 1863)