It is a Meisterstück 144 from the 1950s with a promotional embossing 'Hermes' (promotional gift to business customers, no reference to the brand Hermès or Hermes abrasives). The nib engraving reads 4810/14C/585 (height of Mont Blanc and gold content); the model emerges from the number on the piston end (142, 144, 146 or 149); on the turning knob of the piston, often the nib width is noted (e.g. OBB). The dating to the 1950s takes place on the basis of the celluloid material and the non-melted-in, loosely sitting cap rings – from the 1960s the bodies consist of plastic with melted-in rings. The 144 was produced from 1949 to 1960; the model numbers 13 400 and 13 200 from the 90s warranty papers therefore do not fit this fountain pen.