Ref. : 160 852
Production Date : Unknow – Circa Late 1970’s / 1980’s
The Rotring Primus pen were entry line technical pens aimed at the student / school market. Although of good quality, the pen feels much lighter and skinnier than a regular Isograph/Rapidograph. The nib is very similar to a Variant one and the pen is feed via a pre-filled cartridge system. There is 4 nibs size in this box : 0.25 – 0.35 – 0.5 and 0.7mm. I haven’t found any other nib size for this line of pens. The number on the barrel of the pens (N°I, II, III, IV) suggest that there were no intermediate sizes. It also exist a 2-pen set box.
Despite its targeted audience the boxed-set is very comprehensive. It contains some spare cartridge, a « Rapidomat » type humidifier storage, 2 attachment tools (for compass and writing). The end of the barrel serve as a nib-remover. I guess the red nib-remover tool was added by somebody because it didn’t fit the Primus nib. Same for the ink bottle because the Primus cartridges are non-refillable.
Two instructions sheets were provided : one for the « Rapidomat » storage system, and one for the general use of the pens. The cartoon design of this later clearly demonstrate the target for these pens. I haven’t filled the pens to test how they work as the box I got is really in pristine condition, which is quite rare with the Primus, as they were regularly mistreated and doesn’t shows up in such good conditions very often.