South Australia 1906-12 Thick "postage", perf 12 or 12½, 6d. blue-green block of four imperfor...

(x) South Australia
1906-12 Thick "postage", perf 12 or 12½, 6d. blue-green block of four imperforate between horizontally, fresh and fine mint. Ten pairs, including one in the Royal Collection, and this block are recorded. BW S44b; S.G. 300ab, £5000. Photo

Note: This error was first reported in the "London Philatelist" in September 1918 and listed by Stanley Gibbons in 1940.

provenance:
A. Hind, July 1934
Rev. James Mursell, October 1964
E.R. Slade Slade, 1979
Sir Gawaine Baillie, July 2005
John Williams, March 2010

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