I was given an old pen labled as Soennecken 510, the nib is not original, it has Whal Eversharp goldseal 14K flexible nib, it is still work. There is a logo on the cap, I am not sure it is the orgial Soennecken logo. any information on this pen?

I am not a Soennecken expert by any means, but I know that Soenneckens are quite valued by many. If you can find the correct nib, you may have a keeper.

I am far from a Soennecken expert, but I do have a 510. Your cap jewel emblem looks like some kind of wartime quasi-governmental logo. The Nazi party had literally hundreds of different insignias for different party and governmental arms. The correct nib should probably be an alloy nib. Most have the Soennecken crown logo, but I've seen some originals that are bare of insignia.

http://commons.wikimedia.org/wiki/Image:Fi..._Soennecken.jpg
check here I think it is a company logo, I can not read Germany.

Different eagle: More along the Roman line (one on the right). Just a quick note: In the first example, I blanked out the emblem in the wreath because in some countries where we have readers, it is illegal to display it.

The pen clearly sports a logo similar to the wikipedia illustration: I doubt a firm updates a stone-carving/cement casting of a company emblem very frequently. the design elements are very alike. There's a nib at the bottom. It isn't a Nazi logo.

Here is a rough translation of the German Wikipedia entry cited by chendayuan:

"Company logo of the enterprise 'Soennecken,' over the main entrance of their former factory in Cherry Avenue. Since 1970 the building has been used by Rheinische Friedrich Wilhelm-Universität Bonn as an institute building."

The stone carving itself looks to be from the late 1920's or early 1930's and is very Art Deco in feel. The eagle is holding a fountain pen nib.

Hi Professor, thank you very much for the translation.

Don't be too quick to think it is a Nazi eagle. The eagle was a national symbol long before the Nazis stole it.

This link I found here shows a catalogue thing with nibs on and the logo you have shown. According to the site that catalogue (or whatever it is) is from 1910: http://www.poppelsdorf.de/poppelsdorfer__h..._soennecken.htm

Also the nib it is holding is a dip nib not a fountain pen nib. That is probably because Soennecken pre-dates fountain pens.

I just received a Soennecken 510 in the mail today, also with an incorrect nib. Where would I go about looking for the correct one?

I didn't know that some of my university courses were held in a former Soennecken factory. Back then, it was just one of the countless, often provisoric university buildings and rooms scattered all over the city where I struggled to arrive in time ...