1850.00 Rare original 1840s German octagon bore SxS by M. Holtzer St. Catharines Apr 14, 2024 - 9:10 PM Horsefarmer Super Rare original 1840s German octagon bore SxS by M. Holtzer in Offenberg. From my personal collection, very ornate, engraved, and makers name is in silver. Unique Hamer saftey locks.