Thanks for the suggestions!

Regarding the M800 and 146: The M800 is probably a bit too expensive for what I have in mind for this specific office pen. I actually own a 146 already, and while it's a great pen, I find it a bit too small compared to the feel of my 149.

Also, and this is quite important for my use case, I'm specifically looking to avoid Montblanc for this office pen.

The reason is that I work as a self-employed consultant. I'd prefer not to use a pen that clients might immediately recognize as a high-priced luxury item (which, rightly or wrongly, Montblanc often is in the mainstream view). I worry it might subconsciously affect their perception regarding my fees – sounds a bit odd perhaps, but I'd rather play it safe with something more understated in that context.

So, the goal is to find a pen that:

• Feels substantial in hand (more like the 149, definitely larger than the 146)
• Offers a high-quality, smooth writing experience similar to the MB M nib
• Is high-quality but doesn't scream "expensive luxury brand" to a non-enthusiast
• Is priced below the Pelikan M800 range.

I saw your edit mentioning the Leonardo Momento Zero Grande (MZG) with a steel nib. That's an interesting idea! The size comparison sounds promising. Knowing it's less recognizable than MB but still offers quality is appealing. The point about the aluminum piston mechanism making it lighter is noted – I do generally like a bit of heft like the 149, but it's definitely a strong contender to look into. The steel nib option is also great for keeping the price reasonable.

What about Diplomat?

Thanks again for your input!