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.These years are not completely accurate and are only the years of the entire allotted serial numbers; NA-1951, NB-1956 and NC-1961.Because of this confusion and in the best interest to owners Singer in 2011 deleted all the records and changed it to the present-day that offers a facility for consumers to uncover the history of their personal Singer household sewing machine and discover the year it was issued.
From 2005 to present-day, Singer again changed the dating of serial numbers to a new For all other models from 2005-2011 Singer used the "Culture Management Berlin" list.
This still seemed to confuse owners because it would show the allotted quantity and allotted date for each model.
If the owner of any Slant-needle model sewing machine inputs their Serial Number they will receive a certificate, but guess what?
If you have a "NA" serial number it will have a "Year of Issue of 1951".
When the Anderson factory started manufacturing the Singer 301 it did not include any suffix on the Model Tag.