Made in Germany by 

Edler Onyx Friedrich C Jensen Hamburg 1 (label to the small beaker)

And 

mHN Echt Marmor - Onyx 

Note - I was given this by the original owner (I haven’t combined the pieces to make a set.

Set includes 

Letter holder

Ash tray

Cigarette lighter

Letter opener

Pen tray / holder

Beaker 

Pen 

4159g