A comprehensive listing of all Montblanc models including nib variants can be found in the two books by Jens Rösler: 'Montblanc Diary and Collectors Guide' and 'Collectible Stars'. These standard works are partly antiquarianly expensive (several hundred euros for the Diary, under 100 euros for Collectible Stars) but are regarded as compulsory reading for serious collectors and, through their detail accuracy, often save costly mispurchases. Own overviews from existing literature and websites like fountainpen.de remain fragmentary and quickly hit limits.