TWSBI Diamond 50 Ink Well (Empty) - RedThe perfect fountain pen deserves the perfect ink well bottle. TWSBI Diamond 50 ink bottle provides mess free filling for: TWSBI Diamond 530, 540, 580 TWSBI Mini TSWBI Classic This cleverly designed ink well includes an upper reservoir that fills with ink when you turn the ink bottle upside down (cap on of course!). Then you screw the fountain pen (with the front section removed) directly to the top of the inkwell. Turn the end cap of your fountain
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