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The serial number on YAMAHA VERTICAL PIANOS is stamped on the gold colored plate on the inside of the piano as illustrated in the vertical piano picture. The serial number can be seen by opening the toplid of the piano and looking inside. Japan 1917= 1700 1918= 1800 1919= 1900 1920= 2100 1921= 2650 1922= 3150 1923= 3650 1924= 4250 1925= 4950 1926= 5700 1927= 6500 1928= 7751.
You might have a European model. CETO is the international number used to identify options on the motor.
Used in Holland where I live aswell as in the rest of europe. The T in CETO stands for trim, not the year. Year should be a stand-alone letter on the id-plate: (European models only) D 90 C 91 B 92 A 93 Z 94 Y 95 X 96/ W 97 V 98 U 99 T 00 S 01 R 02 Q 03 P 04 N 05 Last edited by minister; at 05:18 AM.