Piston converters for Montblanc writing instruments are now also being counterfeited, with three main variants known. Counterfeit 1 comes very close to the older variant of the Montblanc piston converter; the differences from the original are barely perceptible, only on the rear grip section is a small deviation visible. Counterfeit 2 and Counterfeit 3 by contrast are very quickly recognisable as plagiarisms because quality and finish are clearly poor and show hardly any commonalities with the original. In a corresponding overview, two originals are set against three counterfeits, where above all material, finish and constructive details of the grip section deliver the essential distinguishing features.