New Zealand 1870–1890 - Bank of New Zealand £1 Green Specimen (Pick S191s)
This specimen carries a dual-prefix serial system, with A197001 at left and B047000 at right. These are not circulation serials but internal control numbers applied by Bradbury Wilkinson to track production stages, plate alignment, and archival referencing. The use of two independent serial blocks reflects early control methodology, allowing cross-verification between printing batches and ledger records. This dual-format numbering is a defining feature of early BNZ specimens and distinguishes them from later standardized serial practices. Read more →