An authorised Montblanc specialist trade with shop premises is basically to be preferred for new purchase, since in case of complaint a direct contact is available. Collectors advise checking the self-presentation pages of eBay sellers carefully: sales counters from business closures or typical formulations like 'house warranty' and 'free special polish' indicate that these are not authorised dealers. Important to know is that such suppliers often deliver real goods but cannot grant a Montblanc factory warranty. Recommended is studying the rating history before purchase and only buying from sellers rated positively several times, ideally where own or others' experience exists.