Nib: X/M Gold
Parker 180 Thin lined gold plate pattern, noted for its innovative flat, X/M triangular nib, which was designed to write two ways, giving the pen two nib grades for the price of one. Converter/ cartridge
The name 180 was derived from "180 degrees" - since You could turn the pen a half turn to write with a thinner line. The Parker "180" had a rigid bar on top of the nib to prevent it from bending and the ink feed held the nib firm from the other direction.