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TWSBI Diamond Mini

TWSBI Diamond Mini Classic
All about nib sizes
TWSBI Diamond Mini Transparent
All about nib sizes
A shorter, pocket-sized version of the Diamond 580 fountain pen. The barrel is shorter than the standard Diamond series pens but the cap can be posted by screwing onto the end of the barrel to create a full-size pen.

Note that the nib section of the Diamond Mini is not compatible with other TWSBI fountain pens (eg. Diamond 540, Diamond 580, Vac 700 and Micarta).