Watch List notes:

(x) Narodowy Bank Polski, a partially hand executed printers composite essay on board for a proposed issue of 500 zlotych, 1971, brown on multicolour underprint, Maria Curie at right, her name alongside her portrait appears with Maria Sklodowska-Curie rather than the common French spelling, arms at low left, reverse, scientific equipment at left, in red-brown leatherette album(Pick unlisted), the 20,000 zlotych of 1989 is not dissimilar featuring the same elements with several major changes, uncirculated and unique, an attractive presentation.

Estimate: £2000 - £2500