Overall: 5 1/8 x 3/8 x 1/4 in. ( 13 x 1 x 0.6 cm )
in relief (inverted): on face of rubber stamp: "M. H. HORNING / HYDE PARK, N.Y."
Mechanical pencil and pen with silver-colored metal casing; rectangular compartment on top contains rubber stamp that springs into position perpendicular to pencil/pen shaft when lid is opened.
Due to ongoing research, information about this object is subject to change.