It is the black Montblanc Caressa No. 422. The model is documented in the standard work 'Collectible Stars' by Jens Rösler and Stefan Wallrafen on page 69 under the ID number 1530. The Caressa was produced between 1976 and 1979 by the firm Mutschler in Heidelberg, which at the time made numerous similar models for Montblanc. Mutschler discontinued business activity in the 1990s.