Good Ebay search criteria but I've found a definite difference if a search term has a 'space' in it...eg.. 600ss is different to 600 ss.
Dont forget to look DIRECTLY in
www.ebay.de as well for unusual stuff, if you try to search from with the Uk using the 'search worldwide' function (Huh!) theres load of stuff in other countries it just does not find.
Germany seems to have shed loads of older duke stuff from time to time - dunno why???
Happy searching - Frank