1913 Double-headed Eagle black opt Turkey 1908 Postage Due 1Pi black on red, perf 12 INVERTED opt. F-VFU. SG 15(var) cat £3250 for normal, should be at least double, £6500 for inverted opt, Mi 15(var) cat €2600 for normal, est €5200 for inverted opt. Extremely rare. 2015 Ceremuga photo cert. (P) (Image1)

Estimate AU$2,500