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I just spoke to my daughter who has a small collection of these bags. She says that she expects to pay £300/400 for a second hand bag in good condition and that they generally have a reference number inside for identification. Also her best advice is to do a search on facebook where there are groups of people who buy and sell these things among themselves. You can apparently join their group and they are very helpful in valuing and connecting buyers with sellers. Hope that helps.Greg