Esterbrook ReNew Point Nib Unit - 8440, Super Fine Cartographic
This Esterbrook ReNew replacement nib and feed unit marked 8440 is 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 is in excellent condition with some minor wear to the gold plating in the center, but has very clean white collar. Note, the nib for sale is not the one pictured.
Please note that Esterbrook ReNew Point nib units are designed to fit vintage Esterbrook pens. These will fit into the modern Esterbrook pens that can accept the MV (Modern to Vintage) Nib adapter, but only by using that adapter.