I recently sold a perfectly working Oris 65 on eBay. The buyer received it, starting wearing it, left positive feedback, then requested a return telling me it stopped working. He shipped it back to me and sure enough it is no longer working. I took it to a watch shop who told me it has a broken ratchet wheel and I need to mail it to Oris as they do not provide parts to anybody.

Does anyone know how a ratchet wheel becomes broken? Does anyone have similar experience selling on eBay or dealing with mailing watch to Oris? It is not in warranty. Thanks ahead