10s gray-blue, with perfect “S” in Postage, mint right sheet marginal vertical pair, position R8/4 showing Double overprint, one inverted error, fresh, very fine, and a spectacular showpiece. Hibernian T68ca; €2’100. Provenance: Bill Fletcher.

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Note: One sheet of 40 showing alternative rows of overprint double, one inverted is recorded. The “Narrow” date high values were overprinted in a two-operation process, however, the double overprint sheet was passed through the press a third time, but the wrong way round. The result is a double inverted overprint on even rows, hence, two such overprints were produced. The status of this error is considered dubious, either overprint in error or deliberately.