case: 1 7/8 x 1 7/8 x 1/2 in. ( 4.8 x 4.8 x 1.3 cm )
diameter: 1 3/4 in. ( 4.5 cm )
inscription: lid, at center, imprinted: "H. Guild & Son/JEWELERS/433 Washington St./Boston"
inscription: lid, handwritten in black ink: "Rec'd April 4/1889/From the Artillery Co."
Bronze struck medal with full-length portait of Robert Keayne with legend: "IN COMMEMORATION OF THE 250th ANNIVERSARY OF THE/ANCIENT AND HONORABLE ARTILLERY COMPANY OF MASS."; in ex.: "Robert Keayne/1st COMMANDER 1638." Reverse shows a figure of Native American within ornate reserve, with arm holding sword above; legend: "ENSE PETIT PLACIDAM SUB LIBERTATE QUIETEM/1888." White rectangular carboard paper case.
Due to ongoing research, information about this object is subject to change.