4 pennies green, block of four, on all sides having full margins and having bright colors extremely fine copy, in perfect condition unused with original gumming and hinge, expertized Georg Buehler and photo expertize Brettl International Association for Philatelie Experts (2012) : " in fine, perfect condition. A very scarce unit. " and expertise Voigt VP (2019) : "the condition is perfect. Scarce unit of the 4 Pfg value from 1856. "