From top to bottom: Rotring 600 Japanese, 600 first series, 600G Japan, Rapid Pro and Retro51 Silver Hex-O-Matic Pencil
The 600 series features traditional Rotring Bauhaus styling, Distinctive hexagonal barrel. the 600 is heavier than many pens, yet well balanced to write with. Sturdy all metal construction. Contoured gripping section, snap cap mechanism.
Rotring 600 Drafting Pencil Silver
Rotring 600 Mechanical Pencil http://www.jetpens.com/Rotring-600-Drafting-Pencil-0.5-mm-Silver-Body/pd/6436
Rotring 600 mechanical pencil
rotring 600 Black