I'm always bouncing back and forth between the same two hobbies, but I know you are more of a vintage collector, while I prefer moderns. I do have a Danitrio Raw Ebonite Mikado Eye Dropper with a stub nib I'm probably going to sell. The pen is HUGE, and the nib is HUGE. This pen eats the MB149 for breakfast. Its nib and filling mechanism make it completely impractical for everyday use, so I'm not sure why I bought it. The ebonite does smell amazing though.
Funny, I just realized I usually shy away from "vintage" audio gear as well.