1915 CEF 1s opt Yacht 1Mk carmine, variety 'inverted S', plus with strong opt offset on back. Superb fresh MLH. Mi 10I, SG B10a cat £1000+, plus premium for opt offset. Only 100 printed (and of these tiny number with opt offset) & desirable positional example. BPA photo cert. (P) (Image1)

Estimate AU$1,000