Central Bank of Oman, a stunning pair of important original design essays for the face and reverse of the 1987 - 1994 20 Rials circulation note, produced by Bradbury Wilkinson, most likely by Derek Friday, presented and framed in a blue leatherette folder bearing a gold Bradbury Wilkinson & Co Ltd monogram to the front, the designs consist of hand drawn, printed and stencilled elements layered on card, this design is almost identical to the 1977 circulation note but research shows that the final design had a number of modifications to the face and reverse of the design, mainly to the borders and the corners, both designs measuring 7.8cms x 18.4cms, in very good condition Oversize