1/4 Riyal

The quarter-riyal denomination is an awkward fit for a currency system built around the rial Omani's 1,000-baisa subdivision — it equals 250 baisa, a figure that doesn't map neatly onto the decimal coinage structure. Oman nonetheless persisted with fractional rial notes through several series, reflecting transaction patterns in a cash-dependent economy where low-denomination paper remained more practical than bulky coin.

De La Rue's involvement with Omani currency dates to the earliest issues of the Central Bank, established in 1974 after replacing the Currency Board.