This sign marks a left-hander nib; in combination, designations like 'ML', 'OL' or 'MOL' arise, with MO being understood as the left-hander variant of an OM nib. Such left-hander nibs are rare collector examples, since the tipping grind is often only recognisable under strong magnification; on smaller nib widths (e.g. FL) the difference from a normal nib is barely visible. The grind is slightly bevelled so left-handers can write without tilting. Such nibs occur both in 149 and in 146 models from the 1950s.