Details
unused Block of Four 1930 Air (horizontal watermark) 1l. and 2l. in sheets of fifty, the former containing a block of four, the latter with a horizontal pair showing the "8 JUNIE 1930" overprint inverted; generally fine and fresh mint, the two errors having been re-attached with gummed paper and with a couple of other minor imperfections. A magnificent and unique pair. Signed Brun and with Friedl Certificates (1981). M.372-73Y var, uncatalogued
Further details
The above errors occured when parts of the sheets became separated and re-attached (with gummed paper) before overprinting. The block of four of the 1l. and pair of the 2l. were replaced inverted by accident, resulting in the overprint appearing inverted