This item is known in the catalogues as one of the following numbers:
Michel: 3 B x (parchment half thick or thin paper) or 3 B y (normal thick, half thick or thin paper) or 3 B z (horizontally ripped paper);
Yvert & Tellier: 6 (thick paper) or 6a (thin paper) or 6b (ripped paper);
Stanley Gibbons: 6 (thick or thin normal paper) or 6c (ripped paper);
OBP: 6 or 6a or 6b (thin parchmentish paper) or 6A or 6Aa or 6Ab or 6Ac (thick paper) or 6B (horizontally or vertically ripped paper).