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The simple answer is they don't know themselves.
They are using the Elizabeth, NJ "Year of Issue" of NA-1951, NB-1956 and NC-1961, each having 1 million serial numbers allotted during those years.
The dates given below are the days on which those batches were started, together with the number of machines in each consignment.
The first Featherweights batched in 1933 begin with the two-letter prefix 'AD'.
Click here for our "Birthdate Machines" chart indicating level of difficulty to find certain years.
When it comes to Anderson factory in 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.
Using the serial number you can use the charts below to find the date when your machine was given a batch assignment at the factory.
If you do not find your machine serial number listed in the charts, then further in the text below will be more references and info.
That means 99% of all "NA" serial numbered sewing machines were not made in 1951.
The 1% that were "Made in 1951" was a Limited Edition of 10,000 Singer Model 301 sewing machines allotted on 25 July 1951 to be manufactured at the Anderson factory.
You must be asking yourself, Why did Singer Customer Service for all these years, and even today, give out the incorrect information?
How Singer can still claim today that all "NA" serial numbers, with 4 different sewing machine models, all being made in the same year, "Year of Issue - NA-1951" is confusing to everyone.
The only record from the Anderson factory is from 1951, that's all.