Details
unused Block Larger Than four -- 4a. yellowish green complete sheet (8x8), with full selvedge, from Setting 12 (1929-30) showing the famous 1a. substituted cliché inverted [8] and inverted clichés [54], [56] and [57]. A rare and splendid exhibition item
Further details
Hellrigl and Vignola estimate that only 50 to 60 examples of the 1a. error exist, all are unused as no cancelled examples are known from this setting