This pen is very similar to the Montblanc 34 pictured here, however, the piston knob is extended, and the logo is placed on the side instead of the end.
Oddly, Montblanc chose to use a threaded connection, despite this being part of a desk set. Unfortunately, I was only able to acquire the pen: I’ll have to keep looking for a matching desk stand.
Body weight: 10.1 g
Total length (not posted): 171.5 mm
Barrel max diameter: 11.7 mm