Editing Rotring 600 (section)

==Knurling==
The early Rotring 600 pencils used to have a coarser knurling grip with the same pattern as the lead indicator.<ref name="gdlm">[https://www.youtube.com/watch?v=QMhj6VqyI9w&lc=Ugz9LoFQoBMxgjF8HKR4AaABAg Comment on video The Japan Specs Rotring 600 mechanical pencil by Guillermo de la Maza], YouTube</ref>. At that time Rotring also released a similar Koh-I-Noor branded pen which shared the coarser knurling. One explanation for the transition to the later, finer knurling might be a desire to appeal Japanese tastes <ref name="gdlm" />. The current (2018) knurling on the grip is the same as the one found on the early 600 ballpoint <ref name="gdlm" />.