The first thing you want to find out, is whether it was made for the Japanese domestic market or for export. I have an export 62 ri jazz, and whilst its a great bass and I love it, they are inferior to the non export models. For example, mine is made of basswood weras the non export ones are generally alder like the usa fenders.
I'm really no expert, but that sounds expensive. A mint condition non export model might be worth that much, try and get some pics and post them here. There's some pretty knowledgeable bass geeks lurking about