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Egyptian used 1866 5pa blue-grey stamp, inverted watermark & 13:13 perforation

Egypt 1st issue, 1866: 5pa light blue-grey (Smith orientation type I) with inverted watermark & 13:13 perf (SG 1e), used + with inverse imprint on gum side showing the template's perforation guidelines (whose Y-axis appears gauged to 10¾ perf) & lithographed overprint. Cat value £400; this color not listed.