50 Rials

Bradbury Wilkinson printed Oman's early post-sultanate currency during a period when the country was still consolidating the administrative reforms Sultan Qaboos had initiated after deposing his father in 1970. The 50 Rial denomination was the highest-value note in general circulation at the time of this issue, reflecting an oil-revenue economy that genuinely needed high-denomination paper in everyday commercial transactions.

P#21 is among the shorter-lived issues in the Central Bank of Oman series — the bank moved relatively quickly through successive designs in the late 1970s and early 1980s as Qaboos's modernization program reshaped the institutions behind the currency itself. Bradbury Wilkinson's New Malden facility closed when the firm was absorbed into De La Rue in 1990.