Age of Yamaha with D before number?

Ask questions on piano history and the age of your piano.

Moderators: Feg, Gill the Piano, Bill Kibby

Post Reply
New Member
New Member
Posts: 1
Joined: 10 May 2017, 11:51

Age of Yamaha with D before number?

Post by williamhawk » 11 May 2017, 07:06

What is the age of this U1 piano? Serial number D1744821. I'm confused by the letter before the numbers. On a British website it said the D meant the piano was manufactured in the 60's, and has two pedals, which this particular piano does have. But then it goes on to say that having a 7 digit serial number means it was manufactured in the 1970's. When typing in just the numbers, leaving out the letter, it says the piano was made in 1974.

Thank you to anyone that can help me out with my confusion! I would like to know when this piano was truly manufactured.

I didn't find the right solution from the Internet.
References ... ost2641582
Explainer Video Example

User avatar
Bill Kibby
Posts: 5423
Joined: 04 Jun 2003, 19:25
Location: Lincolnshire UK

Re: Age of Yamaha U1 with letter D before serial number?

Post by Bill Kibby » 13 May 2017, 13:19

The majority of pianos cannot be reliably dated just by numbers, as I explain at
Near the bottom of that page, I list several Yamaha pianos that I have tuned, and verified the dates. You will have more chance of an accurate date if you look inside. See

Various prefixes are used, and I don't know what N or D mean.
Piano History Centre
If you find old references or links on this site to, alter these to

Post Reply