Hi all, I'm looking to you experts to help me determine what I bought at the local flea market last weekend. I really can't tell for certain, but it writes quite nicely! I do need to find a proper cap though...(this is only an extra I had in the drawer.) The limited information i was able to find makes me think it's a Skripsert. El cheapo pen, but the back end of the pen is flat, not round and is slightly tapered. Nib is silver toned, says Sheafer and takes cartridges. Is there something else this could be? Where would I find a cap? Any and all information, suggestions, guesses are greatly appreciated. (I paid $3 and a quick shot under the faucet and a cartridge later, it's being used again!) Not sure what this black one is, but if anyone can shed light on why it has a silver key like thing, I'd appreciate that, too, lol.