Approximately 1,000 of these two shot rifle-muskets were manufactured by J.P. Lindsay of New York between 1863-1864. They are known to have been tested by or issued to the 5th, 16th, and 23rd Michigan and 9th New Hampshire. "LINDSAY/PATENT'D.OCT.9.1860" marked on top of the breech. Two oval script "ADK" (Andrew D. King) inspection cartouches stamped on the left stock flat.