Yes, real Montblanc 146s from the late 1970s exist that were delivered exclusively with a monochrome 14-carat yellow-gold nib. The absence of the bicolour nib is therefore no sign of a counterfeit. The inner mechanism (piston in metal version) as well as the imprint 4810 14K confirm the authenticity. Fastening details like the cap top screwed in from inside are also typical structural features of the period.