
Occasionally the name on the piano is not the manufacturer but simply a transfer name. In these cases the serial numbers will mean nothing at all.
Experience will help to estimate the age of a piano with no name or with no serial number. The action, the key covering, the style of the casework - all give clues to its age. An educated guess will narrow down the age of a piano to within 10 years or so.
The serial numbers for the piano makers listed below are mostly from 1920 to 2000. There are occasional irregular intervals especially during the early 1940s - the WW2 period - when very few pianos were built in Europe.

Baldwin
Barrett & Robinson
Bechstein
Bentley
Berry
Bluthner
Bord
Bosendorfer

Broadwood
Challen
Chappell
Chickering
Collard & Collard
Cramer
Danemann
Duck, Son & Pinker

Erard
Fazer
Feurich
Gaveau
Gors and Kallman
Grotrian
Hamilton
Hellas

Hopkinson
Ibach
Irmler
Ivers & Pond
Jewett
Kawai
Kemble
Kimball
Knight
Richard Lipp
Marshall & Rose

Nordiska
Petrof
Pleyel
Ritmuller
Rogers
Schimmel
Seiler
Steck
Steinway
Welmar
Yamaha
Zimmermann
The source for most of these numbers is of course the far more comprehensive Pierce's Piano Atlas. The format for each maker is in the form of a simple table.
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