Waltham First Run 18 size 1870 Crescent Street

First run 1870 model, 15 jewel, keywind and keyset from back, serial number 470,682, ca. 1869. Single sunk American Watch Co. dial, Roman numerals. Open face Ladd patent case. The standard lists of Waltham movements show the earliest 1870 models as serial number 500,000. The run containing this movement is listed in the detailed handwritten records.