i have a nice collection of tin vw's but this is the mecca

http://cgi.ebay.com.au/VW-split-window-Kdf-no-tippco-tin-windup-car-Guenterma...

Kinda funny how he won't tell the reserve and latter says it is 6000$ How would you put a value on something like that, should be at cristies or simmilar auction house (is that how to spell "cristies" ?)
also looks like it has a narrowed beam and has been lowered, maybe the maker was looking into the future.