This Esterbrook ReNew replacement nib and feed unit is marked 8440, a Super Fine Cartographic nib made of stainless steel. Esterbrook ReNew nib units are interchangeable, and to change them, you simply unscrew one and screw in another one. This nib has the two-tone starburst style engraving, and is designed for cartography or anything else that required XXF work. This very rare nib appears to be mint, never inked with very clean white collar.
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