Vintage Montblanc Pens - Montblanc 142 - 144 and 146 of the 1950s. They all feature the brass piston mechanism, which is much nicer than todays version. Nibs are OBB (146), B (
Montblanc Meisterstuck Traveller 14k Gold Nib Fountain Pen Case Full Set 142-7 - Body Logic