This is a very fine example of one of approximately 6,000 Model 1842 pistols manufactured by Henry Aston & Co. of Middletown, Connecticut, c. 1851-1852, and approximately 24,000 were manufactured c. 1846-1850 by Henry Aston without the "& Co." marking. This example is dated "1851" on the barrel tang and the tail of the lock, marked with "US/WN/P" the breech, "US/H. ASTON &CO." at the center of the lock with "MIDDtn/CONN" above the date on the tail, with oval script "JH" and "W.A.T" (William A. Thornton) inspection cartouches stamped on the left stock flat, and small "H" and JH" inspection marks on various components.