The mechanism recalls a vacuum system in the style of Parker's Vacumatic; a precise attribution to maker, country and year is, however, difficult, since a converted mechanism also seems possible. On old vacuum pens the inner rubber tank is almost always dried out and mostly no longer fillable. Research in specialist literature (Steinberg, 'Füllfederhalter, Das illustrierte Lexikon für Sammler') led the owner to Parker's patent of 1832, in which by means of piston and rod in the barrel ink was pressed to the nib — the first documented self-filler. A treatment with creep oil loosened stuck parts; the mechanism here consists of piston rod, cork seal and screw spring with knurled screw.