Daphne Guinness exclusively uses rotring pens, thus I will exclusively use rotting pens.  The only choice for serious writers...letter writers, that is.

Daphne Guinness exclusively uses rotring pens, thus I will exclusively use rotting pens. The only choice for serious writers...letter writers, that is.

Part of a pen drawing of Cosmos and Sweet Peas drawn with a .25 Rotring pen on smooth cartridge paper.

Cosmos and sweet pea

• ROTRING ISOGRAPH • The classic steel-nib technical drawing pen • ISO SIZES: 0.10, 0.13, 0.18, 0.20, 0.25, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 1.0 and 2.0 mm. • "The isograph features a refillable ink reservoir, and a patented push-on sleeve gives easy access to the ink helix for cleaning, even when the ink reservoir is full." •

• ROTRING ISOGRAPH • The classic steel-nib technical drawing pen • ISO SIZES: 0.10, 0.13, 0.18, 0.20, 0.25, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 1.0 and 2.0 mm. • "The isograph features a refillable ink reservoir, and a patented push-on sleeve gives easy access to the ink helix for cleaning, even when the ink reservoir is full." •

rOtring 600 silver fountain pen

So, you want to buy a vintage rOtring? A "guide" of sorts.

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