Yonex’s logo for a period of time in the mid-term is like this, a triangle, a trapezoid and a circle.

Your Yonex logo is the Yonex logo started in 1978. There was an older winner in 1973, but it was called YONEYAMA at that time. In 1978, the company's new "YY" LOGO was launched, consisting of blue and green, and soon became well-known in the badminton and tennis circles. A year later, the company and trademark were changed to Yonex.

In 1998, it was changed to the current Yonex logo, which consists of two triangles and two circles.

If your racket is a high-end racket at that time, and it is authentic, then it has a certain value, so keep it in your collection. I'm afraid they are imitations. In 1998, imitations had already appeared in China, and they were imitations of Yonex's old standard.

If you want to know more historical information about yonex, please see

/wiki/YONEX