Pluma Estilográfica Nº COMO NUEVA MONTBLANC MONTE ROSA 042 - Plumín F - RESTAURADA - Pistón - 342 344
The piston knob nib size indicates an EF size, but I believe this is a F. The pen is in excellent to near mint condition, as you can see on the pictures. It is a piston filler pen. The piston itself has been lubricated with silicone grease.