Hi, I know this is a really old thread, but I just wanted to say I have this exact bass. Same color, same pickups, same pickguard, identical in every way, except that mine is missing the ashtray. I'm also looking for information about mine. This thread seems to have the only pictures on the whole internet that look like my bass.
For what it's worth, Invalid Link Removed has a pretty impressive collection of information on TEISCO instruments, and none of them look quite like this one. I'm sure it's not comprehensive, though.