It is a Montblanc Noblesse I (first version) with matt stainless-steel housing, gold-plated fittings and a 14-carat gold nib; these models were made until the late 1980s. Important for distinction: Slimline writing instruments rank below the Noblesse line and are recognisable by simpler workmanship. On some online sources Slimline models (e.g. the 1122) are mistakenly listed as Noblesse — correct attribution is via nib material (gold nib on the Noblesse) and housing version.