Mont Blanc Meisterstuck 146 Le Grand Fountain Pen. This pen has a 14 carat nib in a medium grade. This pen has a piston filler so will use bottled ink only.
With it being a monotone nib this pen would have most likely been made in the 1980s. No plate wear or scratches anywhere on the pen - looks unused but can't be sure as it was bought from a large collection.