Set of 3 Hongdian Fountain Pen Silver Nibs (Fine, Extra Fine and Bent Nib) for Black Forest 1850, 1851, M2,1843, 6013, 517D, 517S, 525,H1, H3, A3, 1843 and 920 Series. Hongdian forest fountain pen (1850,1851), M2, 1843, 6013, 517D, 517S, 525,H1, H3, A3, and 920 Series.