Sheaffer Stylist brushed steel 1966-early 1970s, gold-plated steel nib, brushed steel over plastic, cartridge/converter
The Parker 180 is far from the first pen with a double-sided nib. Early Sheaffer Stylist pens like this one had a similar feature before the Stylist line was switched to the small Triumph point. These formed part of the lower end of Sheaffer's lineup n the late 1960s and early 1970s.