22, New Departure Safety Hammerless, Ladysmith 1902-1911+ Smith & Wesson - Single Action Pistols, First Model.Remington - Navy Single Shot Pistols, Model 8, 81, 24, 241, RB Pistols (Types- not serial), RB Rifles- 1870, 71, RB Rifle Models- 1866-1933, Contract Lee Rifles, Pistols and Revolvers 1857-1918 (incomplete serial number for some), Rifles 1866-1933 (ditto), Shotguns 1874-1910 Serial numbers unknown.Mossberg did not put serial numbers on most long guns until 1968 (GCA 1968 required them).Lefever Sideloack Shotguns before 1913 (not serial numbers).Lefever Sideloack Shotguns 1913 & Later (not serial numbers).(containing serial information about: Baker DB Shotguns, Crass DB Shotguns, Lewis DB Shotguns, Manier DB Shotguns, Flues SB and DB Shotguns, NID DB Shotguns, Knick SB Trap Guns, LeFever Nitro Special DB Shotguns, LeFever 'A' Grade, Western Long Range DB Shotguns, Model 37 Standard Model Shotguns, Model 37 Solid Rib Shotguns, Model 37 All Grade Guns. Ithaca Guns Serial Numbers and Date of Manufacture.Ithaca Guns - Baker, Crass, Lewis, Manier, Magnum, Pre-WWII choke marks, Lefever Singles, Flues, Knick, Lefever Grade A, NID, Western Long Range.High Standard Pistols Serial Ranges 1932-1942.

Other websites that may help (Information from websites other than the manufacturer website should be examined with some skepticism) :