Is the serial number the same as the model number?

No. The model number (like U1 or Model L) identifies the design; the serial number identifies the individual instrument and dates it. You need the serial number to find the year.

My piano has two numbers on the plate. Which is the serial?

The longer plain number is usually the serial; shorter numbers with letters are often plate casting or patent numbers. If both are plain numbers, the manufacturer lookup will reject the wrong one.

Can I date a piano without a serial number?

Roughly, yes: a technician can estimate age from the action design, plate casting, and case style within a decade or two. But the value guide and any insurance appraisal will want the serial number.

Does an older serial number mean a more valuable piano?

Only for a handful of premium makers in good condition. For most production pianos, older means lower value unless the instrument has been rebuilt.

What is a grey-market Yamaha?

A piano built for sale in Japan and later imported used. They are fine instruments but were seasoned for Japan's humidity, and Yamaha's US warranty and parts support don't cover them, so they sell for less than a US-market equivalent of the same age.

Where is the serial number on a spinet?

Usually on the plate under the lid at the top right, or stamped into the wood on the back or the keybed. Kimball and Wurlitzer spinets sometimes carry it behind the bottom panel near the pedals.

Does the Pierce Piano Atlas cover every brand?

Nearly every brand sold in North America since the 1800s, including defunct makers. Technicians and many libraries own a copy; online lookups exist for the major brands.

Will the year change my insurance appraisal?

Yes. Appraisers value replacement cost against age, condition and provenance; the year is the first field on the form.

Piano Serial Number Lookup: Find It, Date It, Value It

Every acoustic piano carries a serial number that tells you the year it was built — and the year is the single biggest clue to what it's worth.

By Joey Bouza, Founder, US Piano Connection · Updated August 29, 2026

A piano's serial number is a five- to seven-digit number stamped on the cast-iron plate or the wooden frame. Match it against the manufacturer's production records and you get the year of manufacture — which, together with the brand, sets the starting point for any honest valuation. This guide shows where to look, how to read the number, and what to do with it.

Where to find the serial number

Upright pianos

Lift the top lid and look down at the cast-iron plate — most makers stamp or print the number on the plate near the tuning pins, often centered or to the right.
If it isn't on the plate, remove the front panel above the keys (it usually lifts straight up or swings out on two clips) and check the plate or the wooden pin block behind it.
Some older uprights (Kimball, Wurlitzer, and many spinets) carry it on the back frame or on the top of the keybed at the far right or left end — pull the fallboard off if the key cover slides.

Grand and baby grand pianos

Open the lid and remove or slide out the music desk. The number is usually on the plate between the bass and tenor sections, or just in front of the tuning pins.
Steinway stamps it on the plate near the tuning pins under the music desk; some vintage grands also have it stenciled on the soundboard.
Yamaha and Kawai grands print it on the plate to the right of the tuning pins, readable from above with the music desk out.

Don't confuse it with a model number ("U1", "K-300", "Model M"), a patent number cast into the plate, or a dealer's inventory tag. The serial number is the longest plain number, and it is unique to that instrument.

Turn the number into a year

Manufacturers issued serial numbers in sequence, so each number falls inside a year's production range. The two reliable sources are the manufacturer itself and the Pierce Piano Atlas, the reference book technicians have used for decades. Here is the fastest route for the brands we see most.

Brand	Fastest lookup	What to expect
Steinway & Sons	Steinway's own serial lookup (steinway.com) or the Pierce Atlas	Complete records back to the 1850s; the year is exact.
Yamaha	Yamaha's official serial-number search (usa.yamaha.com)	Also tells you whether the piano was built for the Japanese market — a grey-market import — which affects value.
Kawai	Kawai America's serial lookup (kawaius.com)	Exact year; note that Shigeru Kawai instruments use their own sequence.
Baldwin	Pierce Atlas; Gibson (current owner) does not publish pre-2001 records online	Year ranges; pre-war Baldwins and Acrosonics are well documented.
Kimball, Wurlitzer, Story & Clark	Pierce Atlas or a Registered Piano Technician	Year ranges; these makers changed hands, so records are grouped by era.
Mason & Hamlin, Bösendorfer, Schimmel	Manufacturer directly (all three answer email requests)	Exact year and often the original finish and dealer.

For Steinway, a few anchor points help you place a number instantly (approximate, from the published production records): serial numbers around 100,000 date to about 1900, around 235,000 to the mid-1920s, around 330,000 to 1950, around 440,000 to the mid-1970s, and around 550,000 to the year 2000. A Steinway in the 600,000s is a 16-to-6-year-old instrument.

What the year tells you about value

Age matters differently for different pianos. A hand-built grand from a top maker can be worth more at 80 years old than a production upright is at 20 — but only if it has been maintained or rebuilt. The pattern in our live listings is consistent:

Under 15 years: closest to new-piano pricing; buyers pay for the remaining life of the action and strings.
15–40 years: the sweet spot for used value on Japanese and European production pianos — fully broken in, decades of service left.
40–70 years: value depends almost entirely on brand and condition. Premium names hold; entry-level American uprights from this era are often worth less than the cost of moving them.
70+ years: either a restoration candidate (Steinway, Mason & Hamlin, Baldwin grands) or furniture. Ask a technician before assuming either.

Once you have the year, our value guide shows the current asking-price medians for your brand, type and decade, drawn from listings on this site right now.

Frequently asked questions

Is the serial number the same as the model number?: No. The model number (like U1 or Model L) identifies the design; the serial number identifies the individual instrument and dates it. You need the serial number to find the year.
My piano has two numbers on the plate. Which is the serial?: The longer plain number is usually the serial; shorter numbers with letters are often plate casting or patent numbers. If both are plain numbers, the manufacturer lookup will reject the wrong one.
Can I date a piano without a serial number?: Roughly, yes: a technician can estimate age from the action design, plate casting, and case style within a decade or two. But the value guide and any insurance appraisal will want the serial number.
Does an older serial number mean a more valuable piano?: Only for a handful of premium makers in good condition. For most production pianos, older means lower value unless the instrument has been rebuilt.
What is a grey-market Yamaha?: A piano built for sale in Japan and later imported used. They are fine instruments but were seasoned for Japan's humidity, and Yamaha's US warranty and parts support don't cover them, so they sell for less than a US-market equivalent of the same age.
Where is the serial number on a spinet?: Usually on the plate under the lid at the top right, or stamped into the wood on the back or the keybed. Kimball and Wurlitzer spinets sometimes carry it behind the bottom panel near the pedals.
Does the Pierce Piano Atlas cover every brand?: Nearly every brand sold in North America since the 1800s, including defunct makers. Technicians and many libraries own a copy; online lookups exist for the major brands.
Will the year change my insurance appraisal?: Yes. Appraisers value replacement cost against age, condition and provenance; the year is the first field on the form.

About the author

Joey Bouza — Founder, US Piano Connection

Working musician and founder of Prospects International, the marketing firm behind appointment-based piano sale events across the country.

Prices and counts in our guides come from live listings on this site and are recalculated hourly. Where we quote industry-typical figures (mover quotes, tuning fees, rebuild costs) we say so, and we never publish a number we haven't measured or sourced.