These years are not completely accurate and are only the years of the entire allotted serial numbers; NA-1951, NB-1956 and NC-1961.What happened to the years 1952, 1953, 1955, 1957, 1958, 1959, 1960, 19.The best and easiest to navigate is Sandman Collectibles' online Singer identification guide.
Please check the links at the bottom of the page for other sites that can help you.
The slide-plate has a circular hole in the end to assist opening and 11 Patent dates are listed starting from Sept 10 1846 which was the famous Elias Howe Patent, through 1849, 1850, 1851, 1854 upto Oct 8 1855. It is worn in the usual places and the jappanning is chipped in places. It is in beautiful condition, with hardly any wear to the decals and only minor chipping to the front edge. Rather than the usual bentwood case it slides into a panelled box case with a hinged door. The Case of this machine is shown on the Cases & Bases Page New Family (Model 12) Serial No. Dating to 1890, this machine has the wonderful 'Peacock Tail' decals which are in very good condition. The head dates to 1900 and the five drawer treadle base with plain cross brace dates to 1895. J476338 Introduced in 1879, early versions of the Model 15 had a fiddle bed, in 1895 a mechanically and cosmetically improved version was introduced. Dated July-December 1918, when we bought this machine the case was locked so we were pleased to find the Lotus decals in perfect condition and the metal work still bright.
When it comes to Anderson, South Carolina Singer only lists 3 Years of Issue for all NA, NB and NC serial numbers that include Models 301, 301A, 401A, 403A, 500A and 503A.
Thanks to Singer's recent 160th anniversary celebration, I was able to pinpoint my antique machine's model year by entering its serial number into Singer's online database.
It's nice to know my sewing machine was manufactured in 1907.