How to check if a Colt is authentic? Like the “Serial Number Lookup”, you should be able to request the Letter Of Authenticity just by visiting Colt website. while a 1894 in 44 magnum with a serial number of 25105098, would have equated to 1975. For example a Marlin model 39A with a serial number of N12478 would have been made in 1955. The barrel and stock are in very good condition with normal wear for a gun. The gun is very good condition and has a 24' octagonal barrel, Lyman Rear Tang Sight and barrel swivels for gun sling. In researching the serial number I found that the gun was manufactured in 1899. Firearm serial numbers were date coded by a prefix within the s/n, as signified below. I recently received a Marlin 1892 Safety. (when the 1968 Gun Control Act was implemented). But by the mid-1970s, the serial numbers stopped continuing from the numbers of the previous ones. 22 caliber bolt action and semi-autos were not serial numbered prior to 1969. Started in 1912, the M1911 Commercial and its A1 variant got normal serial numbers with a simple prefix and suffix. When did the Colt M1911 get a serial number? For example, there is the issue of the 1970s Colt M1911’s commercial production. Fortunately, one of the functions happens to be the “Serial Number Lookup” which permit you to learn about your Colt guns using their serial numbers. I just picked up my very first firearm this weekend and after months of reading, researching and contemplation, I chose the Marlin 795. Re: Diamondback Serial Numbers? How to look up a colt serial number? Now is the age of Internet so Colt duly keeps itself up to date by introducing a website for customers that incorporate multiple helpful functions. Info about Colt Diamondback Serial Number Location Where do I find the serial numbers on a Diamondback? No worries, though the serial overview is under Reference > additional reference > serial numbers and not withing specific areas on models because they are not unique.