As for Dickson serial numbers: #4500 - 1892; #5000 - 1898; #5500 - 1903; #6000 - 1907; #6500 - 1913; #7000 - 1924; #7200 - 1929; #7300 - 1934; #7400 - 1939; #7500 - 1944; #7600 - 1961; #7700 - 1972. The last of the "original" Dicksons was #7759. When production resumed in 1990-91, the first new serial number was 8000. Some guns were finished out-of-order, especially after WWII, so that an earlier serial # may have been completed a year or even two after a higher serial #.