Rotring 600 Mechanical Pencil 0.5 mm 0.7 mm Professional Design Metal - AliExpress
Vintage Rotring 600 Mechanical Pencil, 0.5mm, Silver, New Old Stock
Amazon.com : Rotring 600 3-in-1 Multicolor Pen and Mechanical Pencil, Switches Between 2 Ballpoint Pen Fine Point Tips (Black and Red Ink) and 1 Mechanical Pencil Tip (0.5mm Lead), Silver Barrel : Office Products