By looking at it, I found it having the old Yonex logo, so I guess it's one of those older strings before. (maybe it's before 95?)
In the year of old logo, I only know the following strings: BG-30, BG-43, BG-65, BG-66, BW-470 Then the nowadays strings come, BG-70pro, BG-80, BG85........... This is my first time to see BG-55
Very interesting It is very interesting!! I have never seen BG-55 (0.73 mm) before. Amazing! @ ForrestYung: do you produce the string by yourself?
I know that, Yonex Japan always produces some goods that is only for Japan area. (shirts, shuttles, strings....) , and This may be one of them.
Dear Marc, I cannot produce string, otherwise you will see a new brand FY. But there are a lot of Funny things in Japan Yahoo.