A very fine mint OG LH & NH left margin block of 4 of the 5c sepia Mercury & Globe airmail stamp from the 1930-1935 Arch Issue, showing the reversed plate #1 marking in the left margin. Vertical wove paper with fine vertical mesh and cream gum with a satin sheen. There is some creasing in the selvage tabs that does not affect the stamps. The gum of the entire block at first appears to be NH, but is very lightly hinged on the top two stamps. The bottom two stamps are NH. Unitrade values a VF-75 OG block at $500. The block offered here grades VF-75 LH as follows: Margins/centering: 45/70 Paper freshness: 5/5 Colour: 5/5 Impression: 5/5 Absence of visible paper flaws: 5/5 Perforations: 10/10 Note any vertical or horizontal line shown in the scan is the edge of the acetate strip that the stamp was resting inside on the stockcard. .