A nib exchange between Solitaire and standard Meisterstücks of the same size (e.g. 144 or 146) is technically possible, since the nibs are identically constructed. Standard Meisterstücks, however, have a 14-carat nib; Solitaire models an 18-carat nib; on this hallmark, the exchange can be detected. On the 144, the dealer can carry out the nib exchange by changing the complete front parts; on other models, mostly Montblanc itself is responsible. In the writing behaviour, no difference between 14k and 18k is noticeable, but the value of the writing instrument rises through an 18k nib.