HOW OLD IS MY PIANO?
FREE PIANO IDENTIFICATION & SERIAL NUMBER LOOKUP TOOL
What Year Was My Acrosonic Piano Made?
(Serial Number Lookup + Guide)
DIRECT ANSWER
Most Acrosonic pianos can be dated to a specific production year from the serial number. Look inside the piano by opening the top lid or front panel; the number is usually stamped on the cast-iron plate or on wood visible through a plate cutout near the tuning pins.
Select “Acrosonic” in the lookup tool, not Baldwin. Acrosonic uses Baldwin’s centralized production numbering system, but the serial number dates the piano—it does not identify the exact model by itself.
ACROSONIC PIANO SERIAL NUMBER LOOKUP
WHERE IS THE SERIAL NUMBER ON AN ACROSONIC?
Open the top lid or front panel and look inside the piano.
The serial number is stamped directly onto the plate, or onto the wood, visible through a cutout in the cast iron plate, near the tuning pins.
On many Acrosonic spinets:
- the lid is held shut with spring clips
- it may require firm upward pressure to open
- press down firmly to snap it closed again
DO NOT USE THESE NUMBERS
Do not enter:
“Acrosonic,” which is the piano line name rather than the serial number
a patent number
a cabinet number
digits that are unclear because of wear, dirt, or poor lighting
If the result seems incorrect, re-check the number stamped on the plate inside the piano.
WHAT A ACROSONIC SERIAL NUMBER CAN TELL YOU
An Acrosonic serial-number lookup can usually establish the piano’s production year and place it within Baldwin’s manufacturing timeline.
It cannot identify the exact model, the exact day or month of production, the original owner or dealer, cabinet options, or whether the piano has been rebuilt or restored. It also may not identify the precise factory in every case.
ACROSONIC PIANO HISTORY
Acrosonic was introduced by the Baldwin Piano Company in 1935 and became one of Baldwin’s best-known American piano lines.
Most Acrosonic pianos were compact vertical instruments, especially spinets and consoles.
Baldwin designed the line with its “Full Blow” action, higher string-tension scaling, and more robust construction than was typical of many spinets.
Production began in Cincinnati, Ohio, and later expanded to Arkansas as Baldwin increased manufacturing.
Reviewed by Joe Kemple, Master Piano Technician, Burd and Sons Piano Service · Updated September 2026
Our database includes all Acrosonic piano serial numbers and production years, covering spinets, consoles, and later vertical models.
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