Distinguishing between Noblesse and Slimline is not trivial; even standard literature like 'Collectible Stars' delivers in part contradictory attributions. Slimline is the cheaper variant and ranks below the Noblesse, equipped with gold nib; the piece discussed in the forum was rather assigned by collectors to the Slimline. On the question whether the Noblesse ever existed with steel nib, no final sources exist. Functionally there are hardly differences — both models write excellently, so the correct designation is primarily relevant for collectors.