1881 Battle of Groton Heights Centennial. Bronze. 40 mm. HK-125b. Rarity-6. MS-67 (NGC).Reflective rose-brown surfaces with golden iridescence. Struck to commemorate the Battle of Groton Heights on September 6, 1781. A very elusive so-called dollar type, the present example further enhanced by a bold strike.From the Newmark Collection. Collector envelope with attribution notation included.