Free decoder · Singer · Kenmore · Elna
Type the number stamped on the machine. We read it against the published factory records and tell you the year, the factory, and — for a Kenmore — the company that actually built it, which is never Sears. Every answer shows the exact record it came from.
One box, three brands. Pick the brand, type the number exactly as you find it on the machine, and read the answer with the record it came from.
Free, no sign-up, and the number you type never leaves your browser. Singer answers are the year the serial block was allotted — the record's own date, explained honestly in every result.
On a Singer, the serial is stamped into the bed — top front-right on older machines, underneath on later ones. On a Kenmore, you want the model plate, not the motor. Our serial location guide walks each brand.
The decoder matches your number to the register block, the model list, or the maker's chart it falls in — and shows you that record, not just an answer. If the sources disagree, the result says so.
Most vintage machines honestly sell for modest money — and a few sell for serious money. The value guide shows the sold ranges before you list, donate, or haul yours away.
The full published serial register — over 9,000 dated blocks across 54 prefixes, plus the number-only machines back to 1871. Year allotted, factory, machine class, the real block your number falls in.
Sears never built a sewing machine. The first three digits of the model number name the real maker — White, Soryu, Maruzen, or Janome. Nobody else decodes it in one place. We do.
The Swiss machines carry their year in the first letter of the serial. Elna USA's own letter chart, 1963–1982, plus the first-digit rule for the earlier machines — ambiguity disclosed, not smoothed over.
The honest part
Yes. The decoder is free and runs in your browser — nothing you type is sent anywhere. The paid product is separate: a one-time $39 Seller & Restore Kit for people pricing, preparing or listing a machine.
Published factory records: Singer's serial registers and dating table (via the International Sewing Machine Collectors' Society), Sears' model nomenclature list, Sears PartsDirect model pages, and Elna USA's production chart. This site keeps its own snapshot of the registers, taken in October 2026, so the tool does not depend on a volunteer archive staying online.
It is the year Singer allotted that block of serial numbers to the factory. Machines were built from the block within weeks or months, so it is the accepted dating method — but we print the allotment date as the fact, because that is what the record actually says.
Because Sears never manufactured sewing machines. Other companies built them and Sears sold them as Kenmore. The first three digits of the model number are Sears' maker code, and knowing the maker is what makes manuals and parts findable.
No — and be careful with anyone who will, from a number alone. Value lives in the model, condition, and completeness. The free value guide shows recent sold ranges for the machines that matter; the kit walks the full pricing method.
The decoder tells you what you have. The kit prices it from real sold listings, walks the checks buyers pay for (including the wiring check before anyone plugs a 70-year-old machine in), and gives you the photo list and listing words that move a machine at its real price.
Included in the $39 Seller & Restore Kit