Sailor's Retro series dresses the Profit Junior +10 in the colors of a Japanese era, each with a matching 10 ml bottle of ink. Heisei Pop takes its cue from the 1990s and 2000s, with a clear body and pastel blue and yellow. Showa Retro looks back to the mid-century, in a deep blue. The pen has a steel fine-medium nib and takes Sailor cartridges or the included converter, so you can fill it straight from the bottle in the box.
