If the serial number begins with 'YT', the piano was manufactured in Taoyuan, Taiwan. If the serial number begins with an 'H', the piano was manufactured in Hangzhou, China. If the serial number begins with a 'U', the piano was manufactured in South Haven, Michigan. If the serial number begins with a 'T', the piano was manufactured in Thomaston, Georgia. Home Support Serial Numbers.įinding the Age of Your Yamaha Piano. As a result, there are four different serial number ranges for Yamaha pianos. Yamaha Pianos produced for the North American market have been manufactured in 4 locations. The serial number can be seen by opening the toplid of the piano and looking inside.