I had the pleasure of seeing a very nice vintage fountain pen during a recent dinner with a friend. The pen belonged to the his late grandfather. It is an Omas Extra lever filler with marbled brown celluloid. I love looking at any vintage pens, and noticed that the nib is not the usual Omas vintage nib. It has a kind of sheep(?) imprint on the nib with "14K-585" and "OSMIUM" on it. I didn't write with it, but I tried on my thumb nail and it feels very soft and flexible, a typical wonderful vintage nib of that era. With the permission of my friend, I posted the photos of this pen in the hope that someone might know what this interesting-looking replacement nib is. Many thanks!
By the way, I had offered to restore (lever is stuck and also needs new sac for sure) and polish this pen for my friend, but he doesn't want. He wants to leave the pen as how it was when he received it, and only uses it as a dip pen. I understand.