Typical recognition features for counterfeits are unusually designed rings with indentations, stamped instead of laser-engraved serial numbers — Montblanc has never stamped serial numbers — as well as size deviations, e.g. a too-small cap top. A description like 'The serial number is a model number and the same for every model range' is also factually wrong and a clear warning sign. Such fakes often come from China and cost in procurement a few euros. In dispute with the seller, it is recommended to remain factual, not to enter into personal discussions and, if applicable, to turn to eBay, Montblanc or a specialist repairer (e.g. Tom Westerich).