Grotrian-Steinweg serial numbers and piano age

To estimate the age of a Grotrian-Steinweg, start with two things: the complete name on the instrument and its factory serial number. The wording helps identify the maker; the matching number may then narrow down the production date. A similar-sounding company name is not enough.

Grotrian-Steinweg or Steinway & Sons?

Older Grotrian instruments may carry longer inscriptions, such as “C. F. Th. Steinweg Nachf.” or “Steinweg Nachf., Grotrian, Braunschweig”. The Grotrian-Steinweg name came later. These inscriptions belong to the Grotrian context discussed here and should not be read as Steinway & Sons. The two makers’ serial numbers are not interchangeable. Name distinctions in the Piano Atlas.

Copy initials, wording such as “Nachf.” and any place names as well. If only “Steinweg” can be read, the full identification remains uncertain. A photograph of the entire inscription is more useful than an abbreviated transcription.

Which number helps date the piano?

Look for the factory serial number of the upright or grand itself. A number on the action or keyboard may identify that component instead. Likewise, a year shown on a medal does not establish when the piano was made.

Record where you found the number. An overview photograph and a close-up make it easier to identify the marking later. Keep letters and leading zeros, and do not replace illegible characters with guessed digits. Help with factory numbers and unreadable characters.

How precise is a Grotrian-Steinweg age estimate?

A matching serial number can provide evidence for the production year. A year estimated from comparison numbers is approximate, rather than a documented completion date. Missing characters or more than one possible identification may limit the answer further. Read the notes accompanying the search result as well as the date.

If the factory number cannot be read, the complete name and other features may still help place the instrument in context. A company’s founding year or a date on a component is not automatically the production year of the whole piano. Understanding the limits of piano dating.

Look up a Grotrian-Steinweg in the Piano Atlas

1. Start with the name and select the entry that matches the complete inscription.
2. Enter the factory number as written, including any additional characters.
3. Read the result together with its qualifications. If the identification is unclear, first obtain a clearer photograph of the marking.

Look up a Grotrian-Steinweg in the Piano Atlas