I was at the Scriptus pen show this afternoon and picked up a 1924 Parker Duofold Junior.
(That’s Diamine Macassar ink. I like Diamine inks—they always work well for me.)
This page has a complete history of the Duofold, with all kinds of details.
Last year I got a Parker 51 at the show. Like everyone says, it’s a great pen. It felt right from the first minute I tried it, and it’s always perfectly reliable. It is a pen that will always be a pleasure to use and I bet it will last for decades more. I think the Duofold Junior will be the same.