This always seems a strange question. The inevitable answer is, it's worth what someone is prepared to pay for it, at the time. That is the advantage of an auction, whether on this site or E-bay. Providing you give a longish period to generate interest and there are at least 2 interested parties, it should find the best price at that time.
A lot of the problems with "expert valuation", is that the expert is'nt buying the item. The price will vary, it depends how many are on the look out for the item at any one time.
A lot of the problems with "expert valuation", is that the expert is'nt buying the item. The price will vary, it depends how many are on the look out for the item at any one time.