Two Pens I Wish To Know More About

[emrebugra]

Hello everyone, this is my first post here, and I'm asking for some help. A friend of mine is a collector of some sorts, and he recently acquired two pens.
 

The first one is probably a Waterman Continental safety pen, but it has a Montblanc "D" nib and a Montblanc logo. It seems odd, and I'll put some pictures.
 

The second one is a Parker 51. This pen came from Denmark, and it has the name "Arne Jacobson" inscribed on it. However, that's the extent of information we have. We don't know if it's related to the famous architect.
 

If you have any further information about these pens it would be very welcome. 
 

Have a nice day! 

[Nethermark]

Nice Parker 51. I just checked: right now there are 56 men named Arne Jacobsen in Denmark. The first name Arne is considered oldfashioned nowadays, so I guess at the time this Parker 51 was engraved, at least severeal hundreds of men were called Arne Jacobsen. So it's possible, it was owned by Arne Jacobsen the architect, but it's not very likely.

 

I'm a bit in doubt about the Montblanc. It doesn't look like a normal Montblanc safety, but they did make Waterman type safeties, as yours is: https://www.vintagemontblancpens.com/night-day-overlay-safety-montblanc . I've never seen the snowflake placed at the bottom end. The D in the nib designates a very hard manifold (Durchschreiber) nib made for copying notes etc. with the use of carbon paper. The nib looks a bit younger than the pen. Now, I'm no Montblanc expert, so I would advice you to contact Max Schrage or the people at Penboard to get an ID on this model.

[Arkanabar]

I'd be interested in seeing the internals of your P51.  This will give us a much better shot at telling how old it is.