Indications of a subsequent brand counterfeit are, among others, a logo that does not correspond in size, placement or plasticity to the known Montblanc conventions, as well as a star with a white ring that has only been used in recent times and therefore does not fit a declared old set. Complementarily, comparison with Montblanc stickers from today can indicate pure sticker application on old pieces. Atypical style elements that fit no documented original product of the stated era are an additional warning sign. If a seller reacts to corresponding factual hints demonstratively dismissively or insultingly, this is a further indication that it is not a reputable original auction.