It would help to know where you are:
http://www.tokaiforum.com/viewtopic.php?t=13896
I don't believe that we had the modified headstock shape in Britain as early as 1985, & I sort of assumed that applied to the rest of Europe as well. But you could be anywhere.....
It might be an idea to post it in the Bass section, where the four-string types lurk - they might have a better idea.
Mike