A Singer's serial number is the quickest way to learn where and roughly when it was made, and it's the first photo worth asking a seller for. Singer kept records of the number ranges it handed to each factory, and collectors have published them. Here's how to read one, and where the dates can mislead you.
What the date actually means
Singer allocated serial numbers in batches, so the dates in its records are allocation dates, not build dates. Singer's UK history site points out that numbers were planned ahead of production and could be stamped on machines months or even years later. The Featherweight Shop takes a narrower view and says a Featherweight was typically assembled within weeks of its batch being allocated. Either way, treat the year as close, not exact.
The letters matter as much as the digits. From 1900, Singer put a one or two letter prefix in front of the number, and each factory used its own letters. A machine with no letters at all usually dates from before 1900. Machines from the 1850s to 1889 can carry two numbers, a register number and a factory number, and ISMACS, the International Sewing Machine Collectors' Society, keeps separate databases for those early machines.
Elizabethport, New Jersey
Most older Singers sold new in America came from Elizabethport. Its early prefixes are single letters, and they don't run in alphabetical order:
- N for 1900, L for 1901, K for 1902 to 1903, B for 1904 to 1905 and D for 1908 to 1909.
- G from 1910 to early 1924. This is the range for a 1910 batch of the Singer 27, and some G batches went to the Canadian factory.
From 1924 the factory moved to two-letter prefixes starting with A:
- AA 1924 to 1926, AB 1926 to 1928 and AC 1928 to 1930.
- AD 1930 to 1935, AE 1935 to 1938 and AF 1938 to 1941.
- AG 1941 to 1947, a range that spans the war. Elizabethport made no domestic machines from June 1942 to July 1945.
- AH 1947 to 1948, AJ 1948 to 1950, AK 1951 to 1952, AL 1952 to 1955, AM 1955 to 1959 and AN 1959 to 1964.
So a Featherweight numbered AD541546 is from the very first batch of 221s, allotted on October 3, 1933, and a 201-2 starting AF is from the late 1930s.
Kilbowie, Scotland
Singer's Clydebank factory at Kilbowie built machines for Britain and much of the world, and many have since come to America. Its model numbers usually end in K, as in 221K or 99K. Its prefixes are trickier, because the early letters weren't issued in order. Singer's own chart notes that R came before J and V came before F.
- J for 1904 to 1905, F for 1910 to 1920 and Y from 1920 to 1935.
- EA from 1935 to 1937, then ED for 1941 to 1947 and EE for 1947 to 1949.
- EF 1949, EG 1950, EH 1951 to 1952, EJ 1953 to 1954, EK 1954 to 1956, EL 1956 and EM 1956 to 1957.
- EN 1958 to 1959, EP 1959 to 1960, ER 1960, ES 1960 to 1961, ET from 1961 and EV from late 1962 to 1964.
A 99K with an EV number is from the early 1960s. ISMACS records 99K batches allocated as late as 1963, later than some histories say the model ended.
St. Johns, Quebec
Singer's Canadian factory opened in 1904 and began production in 1906. Until 1924 its numbers were issued by Elizabethport. From 1924 it had its own two-letter prefixes:
- JA 1924 to 1936 and JB 1936 to 1948.
- JC 1948 to 1954, JD 1954 to 1961 and JE from 1961.
Canadian model numbers end in J, like the tan 221J Featherweight, most of which were made at St. Johns between 1961 and 1969.
Anderson, South Carolina
Singer opened its Anderson plant to build the new slant-needle machines, the 301, the 401A and 403A, and the 500A and 503A. Its prefixes start with N. Singer's chart gives NA for 1951 to 1959, NB for 1959 to 1961 and NC from 1961.
The sources don't agree on NB. The singer301.com registry, which tracks the 301 closely, puts the 301A's NB numbers in 1956 and 1957, when the 301 went out of production. For a 301, use that registry. It also shows the first 10,000 numbers of July 1951, NA000001 to NA010000, were a limited edition with special badges, and that the 301A begins at NA185751.
Model letters and other factories
The letter at the end of the model number backs up the prefix:
- K means Kilbowie.
- J means Canada.
- G means Germany.
- U means Japan.
The A in 301A, 401A and 500A is sometimes said to stand for Anderson, but Singer's UK history site and singer301.com don't support that for the 301, so don't lean on it. Singer also had factories in France, Germany, Italy, Russia, Brazil and elsewhere, each with their own letters. Bridgeport, Connecticut used a W prefix from 1954. If a number doesn't fit any of the lists above, ISMACS's serial number database lists batch by batch which model each range was allocated to.
Using the number when you buy
The serial number can't tell you condition, but it catches mismatches. A listing that calls a machine a 1950s Featherweight while its number starts EE is a Scottish 221K from the late 1940s. A "rare black 221J" is worth questioning, since ISMACS says all known 221Js are tan. An AG number on a 221 tells you it was made just before or just after the war, not during it. On machines like the 15-91, where the model isn't always clear from the photos, the number confirms what you're looking at.
So ask for a sharp photo of the serial, read the letters first, then the digits, and check the batch in the ISMACS tables if the machine is one you care about. For the Featherweight's own versions and what each looks like, read our Featherweight variants guide, and for everything else, see every Singer we cover.
