1978 vintage.
Each piano is individually numbered, and the year and date of production can be determined. For example, for second-hand Kawaii pianos, the ones with more than 1 million numbers are from 1979, the ones with 1.5 million numbers are from 1984, and the ones with 1.7 million numbers are from 86 years. Numbering refers to sequentially numbering or programmed numbers using any symbols in order or disorder. The definition of numbering is to give sequential numbers as a method of identification, limited to limited or certain numbers, numbered in sequence, and assigned numbers.
There is a very important part of the piano accessories that is equivalent to the human heart. This is called the thimble. Most of the thimbles in the piano thimble are made of plastic (because the thimble is used to support the hammer for striking). Striking the strings is a wear and tear object). However, Kawai has applied for a patent to use ABS resin, which is a material that cannot be used in any piano. Therefore, whether it is a domestic piano or a Yamaha piano, the thimble can only be made of plastic. A normal plastic thimble has a piano life of 20 or 30 years, while a Kawai can last 50 or 60 years. That's the difference.