Hammerless top-breaks have no hammer spur and a flatter rear frame.
| Year | .32 Serial | .38 Serial | |------|------------|------------| | 1896 | 35,000 | 1 | | 1900 | 55,000 | 10,000 | | 1904 | 80,000 | 25,000 | | 1908 | 110,000 | 40,000 |
Hammerless top-breaks have no hammer spur and a flatter rear frame.
| Year | .32 Serial | .38 Serial | |------|------------|------------| | 1896 | 35,000 | 1 | | 1900 | 55,000 | 10,000 | | 1904 | 80,000 | 25,000 | | 1908 | 110,000 | 40,000 | pistol identification iver johnson serial number chart