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The Franc Poincaré is a unit of account that was used in the international regulation of liability. It is defined as 65 miligrams of gold of millesimal fineness 900. Formerly it was identical to the French franc, although it has not been so since the 1920s.
Practice on its conversion to national currencies varies from state to state; in most states the conversion factor is based not on the market price of gold, but on an official price (a remnant of the gold standard, frequently far below its market price today). The Franc Poincaré has been replaced for most purposes by Special Drawing Rights.
Conventions which used the Franc Poincaré included the Convention for the Unification of Certain Rules Relating to International Carriage by Air, the International Convention on Civil Liability for Oil Pollution Damage and the International Convention on the Establishment of an International Fund for Compensation for Oil Pollution Damage.