Riau, though part of Dutch and Indonesian territory, was economically under the influence of neighbouring Malaya.
[1] In order to affirm its fiscal stake in the region, a decree was passed on 15 October 1963 to replace the Malaya and British Borneo dollar (the circulating currency) with an Indonesian-issued currency, the Riau rupiah, which replaced the dollar at par.
Bank Indonesia notes were printed by Indonesian printer Pertjetakan Kebajoran dated "1960" with the overprint 'Riau' in denominations of 5, 10 and 100 rupiah, all carrying the image of President Sukarno but with colour and other design differences.
Lower denomination notes, under Indonesian (and previously Netherlands Indies) law were the issuing privilege of the Indonesian government, and for Riau bore the date "1961" with the overprint "Riau", in 1 and 2 ½ rupiah denominations.
Green (1) and blue (2½) variants of the 1 and 2½ notes had also incidentally been printed, intended for issue in North Borneo, which Indonesia saw as a possible extension to its territory due to the power vacuum in the region at that time.