It is an original 146 (LeGrand) from the 1980s: models of that period had monochrome yellow-gold nibs, no clip-ring number yet and only "Germany" as origin indication. The corrugated (instead of monochrome grey) ink-view window points to the late 1980s or a later barrel with an older nib. The additional perforated ring at the barrel end is a defect — the blind cap was not pushed fully forward — and should be addressed with the seller before purchase. An adjustment Montblanc charges via the service flat rate 2 with reservoir exchange; cheaper is a repair via specialised workshops like Maxpens, provided they cover the production period.