I just received this Brause 3010 pen from an eBay seller. It has a very smooth nib, between a medium and a broad as best I can tell; I'm still soaking old ink out of the feed. It came with a dried-out short international cartridge in it, but looking down inside the barrel I see a shoulder that I'd expect the end of the cartridge to rest against, which leads me to think a different cartridge belongs in there. I can keep tinkering with what I have on hand, but if anyone knows what cartridge should be in there, please tell me!
I'd also like to know when the thing was made; styling suggests mid-50s to mid-70s to me.