1st Gen. Modern Parker Duofold Int'l MK1 Marbled Blue Fountain Pen 18K Nib
St Gen. Modern Parker Duofold InternationalMK1 Marbled Blue Fountain Pen 23K Gold Trim 18K M Nib (Discontinued). In 1988, Parker reintroduced the iconic 1920s Duofoldline to celebrate its 100th anniversary.