Bulgarian National Bank, a set of watermarked papers for the 1929 issue, comprising 200, 250, 500, 1000 and 5000 Levs, each individually glued into black frames of thin card, ink annotations on frames, as produced, rare (5 papers)
BNB B156-B160, Pick 50-54 £300-£400

These items are directly from the Portals Paper archive