1 Kak 0.1 Riel

The People's Republic of Kampuchea was proclaimed on January 7, 1979, the day Vietnamese forces entered Phnom Penh and ended the Khmer Rouge regime. Pol Pot's government had abolished money entirely in 1975 — banks were emptied, currency destroyed, and the population forcibly relocated. The PRK therefore had to reconstitute a monetary system from scratch, and these fractional kak notes were part of the first currency introduced into a country that had been cashless for nearly four years.

The kak denominations circulated alongside riel notes as the new government attempted to restore basic market activity in conditions of extreme scarcity and ongoing conflict in the western provinces.