On the rollerball, the rear body part is, on the counterfeit, black instead of — as on the original — executed in metal. On the StarWalker fountain pen, the original carries a characteristic, clearly different nib that the counterfeits do not reproduce in this way. Generally, auctions are suspicious that run only one day, in which the sellers come from typical counterfeit regions like China or Poland, or in which the names of the highest bidders are hidden so that they cannot directly be warned. A direct reaction by eBay to hints is experience-based ineffective; whether Montblanc on direct contact intervenes faster is unclear.