TWSBI Diamond Mini Classic Fountain Pen

Twsbi Diamond Mini Classic is a piston filler fountain pen, which is roughly the same height as an iPhone when capped.

Slightly longer when cap is posted on the pen.

About 1 inch shorter than a Diamond 580 fountain pen.

If you write small, go with an EF
For the normal writer, F is the most popular
If you tend to lean on a bigger font, M will be perfect
Stub 1.1 nibs are italic in writing style (have a special card or invitation to write?)