TWSBI Diamond 50 Ink Bottle
TWSBI Diamond 50 Ink Bottle
TWSBI Diamond 50 Ink Bottle
TWSBI

TWSBI Diamond 50 Ink Bottle

$25.00
The TWSBI Diamond 50 Ink Bottle is a beautifully designed glass bottle with an anodized aluminum cap, made to simplify and enhance your fountain pen refilling experience. Suitable for all fountain pens, it features a clever upper reservoir system that fills when the bottle is inverted (with the cap securely on), allowing for easy access to ink even when levels run low with no need to dip your nib deep into the bottle.

For TWSBI Diamond 530, 540, 580, and Mini fountain pen users, there's an extra bonus: a special filling cap is included that lets you refill directly by attaching the pen's barrel, completely bypassing the nib. Just remove the front section, screw the barrel onto the adapter, and twist the piston knob to draw ink - clean, convenient, and no inky fingers.

Note: Ink not included.
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TWSBI (pronounced TWIZ-BEE) has become a staple in the fountain pen community, known for its high-quality, piston and vacuum-filling demonstrator pens at an exceptional value. Though it may seem like a newer brand, TWSBI’s history spans over 50 years as Ta Shin Precision, an OEM manufacturer producing parts for well-known brands. A decade ago, the company shifted to designing its own pens, combining traditional craftsmanship with modern innovation.

With a name inspired by Chinese calligraphy, TWSBI is dedicated to creating durable, high-performing pens featuring smooth stainless steel nibs, excellent cap seals, and transparent designs that showcase their intricate filling mechanisms. Their user-serviceable approach, with included tools for maintenance, makes them a favorite among writers, professionals, and pen enthusiasts looking for reliability, style, and a hands-on writing experience.