I wanted to share this pen because I'd love to learn more about early Parkers. Is it relevant that this pen isn't an eye dropper, though it has a slip cap?
Here's a Parker #20 Self Filler in mottled red hard rubber. I thought it was pretty unique to see that this pen had a slip cap with a button filler. I am so used to seeing slip caps on EDs. Would you guys agree that Parker ended the MRHR and Slip-caps around the same time that they introduced Button Fillers?