Island of Leros, airmail parcel authorization stamp, violet blue hand-stamped imprint "INSELPOST", variety "inverted imprint", mint with hinge, various weak stock points - visible on the face side only faintly at the upper edge of the stamp, the perforation is well executed except for minor irregularities at the lower edge, very rare stamp, photo certificate Mogler BPP, which confirms both the authenticity and the rarity and notes that the quality impairments should not be of concern, Michel 3. 000.-