Interesting item on ebay

Thought this may be interesting to some here.....
http://cgi.ebay.com/Soviet-viewfinder-a-prototype-never-sold-to-public_W0QQitemZ280215886949QQihZ018QQcategoryZ30030QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

The seller is a fedka too:-)

This is an odd finder. It is obviously homemade, but the selection of the focal lengths is unusual:

1.5 cm (15 mm)
5 cm (50 mm)
18 cm (180 mm)
7.5 cm (75 mm)
2.5 cm (25 mm)

With the exception of 50mm, none is for the existing LTM lenses. So I suspect this was for some sort of cine camera, perhaps even a director's finder.

I just made offer to buy this item for $50. It made seller mad [:)] He really think he holding gold in his hands [:D]
Well we saw a lot of crazy prices on eBay.

Now he asking $320 [:)]
Does it worthe it?