I have a Keith Haring poster, and it is signed by him. This is what it looks like: (NOT MY AUCTION)
http://cgi.ebay.com/KEITH-HARING-LEO-CASTELLI-1985-Exhibit-POSTER-PRINT_W0QQcmdZViewItemQQitemZ370227966192#ht_500wt_782
my copy has a small rip at the top though....
about how much should I charge as a starting bid?
Start the price for the minimum you wish to receive for the poster. (dont overvalue it either cause you probably wont get any bids)
Also mention the rip in your listing too otherwise you might get an unhappy buyer.
You could also research items already sold by going to advanced search > check completed listings > type in Ketih Haring in the item field. That way you can see items sold & the price they went for.
Im sorry, dont know who Keith Haring is, so am unsure on how popular he is & whether your item will generate much interest?
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