What's a unicorn worth?

[JohnD]

In 1974 I bought a new Berkshire 100 Enduro which I rode for a short time.  I kept that bike under roof ever since.  It was ridden less than 1000 miles and competed in only 1 Enduro, the Little Harpeth National Enduro, placing 6th in class with me as a B rider.
I've been considering either riding or selling it.  Knowing it's value may help me decide.
Any help out there?