I think the serial number starts with the letter 'N'. Winchester Model 1400 MKII 12ga. A Winchester 1400 was the first firearm I ever bought.

• ^ Although first produced in 1904, this rifle was initially marketed simply as the 'Thumb Trigger' until February 1919 when it was assigned the model number 99 for the year the design was patented. Winchester simultaneously dropped the initial 2 digits from all year-numbered models for advertising reasons, so the preceding '18' was omitted from the outset.

Model 99s were never actually marked as such; the designation was used only in sales literature. • ^ The model number 55 was used twice; the two rifles were entirely dissimilar and were not produced concurrently. • 66 was not used, to avoid confusion with the Model 1866 • ^ Winchester added the suffix '7' to the Model 67 and 69 when equipped with and no provisions for. These rifles, although seemingly out of numeric sequence, can be accurately described as variants rather than separate models. • 73 was not used, to avoid confusion with the Model 1873 Bibliography [ ] • Houze, Herbert G.

To the dreams of youth: Winchester.22 Caliber Single Shot Rifle. Iola, WI, USA: Krause Publications, Inc. External links [ ] •.

Thanks.Am new to all of this as I've finally taking out some of my grandfather's guns to learn about them and what he used them for. Been packed away for over 25 years. What I have of his is a Mauser Argentino 1909 rifle, Winchester model 1400 MKII 12 ga, and a Ruger 10/22 carbine.