This a very uncommon Monterosa, one Montblanc's second line pens. The best information I can find says the Model 41 was made for export in the early 1960s. It's lightweight plastic, a piston filler, and has a gold-plated steel nib. The ends (cap and barrel) are faceted, while the center is round.  This particular example has very little wear - it looks great!  5 5/16", 135 mm. A very collectible example of a very unusual pen.

Price: $175 inclusive of S/H/I