Island Leros, admission stamp rouletted, overprint "island post" in black blue purple colour, block of six with following types III - IV - III in of the upper alignment and I - II - I in the lower alignment - therefore all fours different overprint types inside one unit, unused with original gumming (adhesions, trace of creases) - right upper stamp strong corner fault, roulette in total clean, photo expertize Petry BPP (2018) : "as block of six very rare. ", Michel 2.400.- (free of premium for the scarce unit! )