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 http://forum.pianoworld.com/ubbthreads. ... ost2641582
Explainer Video Example
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.