5 Mark on 7 1/2 penny Germania, block of four from left margin of sheet with following overprint types AIa, AIb, BIIa and BIbs BI, mint never hinged, horizontal perforation prefolded, faultless condition, photo expertize Matthew buck BPP (2024) \"the quality is perfect. \", Michel 530.- (free of premium for type pairs, because these by Michel not valued are)