Thank You Colin for the info
in a meantime i got some new photos
on one there's a serial number:
http://img705.imageshack.us/img705/6553/tokai5.jpg
second with a head:
http://img820.imageshack.us/img820/5598/tokai6.jpg
edit: ok i found this
http://www.tokaiforum.com/viewtopic.php?p=141418&sid=b57c5b6f1dce3fb660915aac5b765b6e