Rotring 600 Fountain Pen review 4K

Review and taking apart of a vintage discontinued ROTRING 600 black fountain pen in 4k resolution. rOtring 600 - produced between early 1989 until ? 1998 - Made in Germany / Japan Timestamps 00:00 Intro 0:18 History - Measurements 1:33 Nib - Cartridge 2:18 What it is made of 3:05 Original or not? 4:39 Nib size selector or ink color selector 5:28 Durability issues 8:24 Ergonomics 9:14 Writing sample 10:27 Thanks