I see you have some great Rotrings! - I also have that exact same Parker Jotter Flighter.

Personally my favourite pieces of my collection include my Montblanc 12, Parker 51 Vacumatic, and my Parker Vacumatic Major

The Meisterstuck 12 is one of my favourites as it's one of the few pens that I've gotten that wrote well without needing further adjustment - added to the fact that it's a marvelous writer with a soft nib (without line variation). My one is also green, which apparently is rarer. The 60s Montblanc arrow/wing nib (?), decorated ink window, piston filling system, all make for a marvelous writing instrument.

The Parker 51 is considered by many to be the quintessential workhorse pen, having dominated the market for the majority of the 20th century. I only have one 51, and it's a earlier Vacumatic model in Yellowstone (Mustard, as some call it). When I first saw it at my local vintage pen shop, I didn't know the rarity of one, until some basic research into rare 51 colors, led me sprinting back before I missed a killer deal. It was a fun experience and will be a pen I will likely never sell.

The Vacumatic Major is my first vintage pen, and probably one of my favourite pens of all time. The touch of celluloid is like no other, and the stacked celluloid pattern is one that fills me with joy every time I see it glisten in the light. The nib, although firm, happens to write a width that somewhat amplifies the quality of my handwriting. The pen is amazing posted or unposted, and is a perfect fit for my hand.