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You’re going to want one in each color! The rOtring Primus was designed as a student pen and pencil. The barrel is made of wood stained bright yellow to match the cap end. These were not imported to the US. This is a lightweight rOtring Esprit fountain pen produced in the late 1990s, made of anodized aluminum with the trademark rOtring red ring around the top of the cap. I’m finding very little information on the Rivette, but it sports the reliable basic rOtring nib. It is plastic and lightweight but a decent diameter. rOtring Initial ballpoint in blue and silver. New in box with papers. 
rOtring Clipper ballpoint
rOtring Primus youth fountain pens & pencils
rOtring Esprit Tourmaline Green fountain pen
rOtring Rivette fountain pen, Nautic Blue
rOtring Initial ballpoint, blue/silver – NIB
fountain pen users 