Thanks, sixburgh.
Well...my guess is that Japanese people went absolutely crazy about NBA in mid 90's and bought lots of authentic jerseys.
Seems like they are getting rid of their stuff right now that is good for me
At second-hand store. Actually it was 8,640 JPY that is about $75.
Store clerk wasn't sure if it is a real autograph of MJ.
Sorry for my poor English, I'm Japanese