The "Pahlavi Coins" () were the official gold coins of Iran from 1926 to 1979, and the term "Pahlavi" is the currency of these coins. These coins replaced the Qajar Toman gold coins when Reza Shah Pahlavi came to power in 1925 and the monetary system changed in 1926. In 1979 and coincidence with Revolution in Iran the name of these coins changed to "Bahar Azadi" coins. History The first Pahlavi coins, which were minted from 1926 to 1929, only in gold purity (0.900) and coin margins (oak and olive branches) were similar to Qajar coins, and differs from not only in terms of design, type and timeline, but they changed fundamentally in their weight and calendar system. In fact, in this period, only in 1926, the standard of the Toman coins weighing (2.85 grams) was used to mint gold coins. Thus, two thousand dinar coins (one fifth Tomans) and five thousand (half Toman) of Qajar gold coins were generally removed, and coins of one, two and five Pahlavi were replaced with coins of one, two and five Tomans. Pahlavi coinage rules Rules of gold coinage in Reza Shah era The law of determining the unit and the scale of money This law, legislated in National Majlis on 14 March 1930, had 14 articles of which some of them as follows: Article 1- Gold Scale: The legal currency of Iran is the Rial of Gold, which is equivalent to one hundred dinars. Article 2- Coins and their scale Gold Coin: Twenty Rials called Pahlavi Gold Coin. Ten Rials called Half Pahlavi Gold Coin. Article 3- Net weight and coin weight A Rial is equivalent to 0.3661191 grams of pure gold. Pahlavi gold coin (equivalent to twenty Rials) has 7.322382 grams of pure gold, one kilogram of pure gold should be used for 1365675 pieces of one Pahlavi gold coins. Half-Pahlavi gold coin has a weight of 3.661191 grams of pure gold, one kilogram of pure gold should be used for 273,135 pieces of half-penny coins. Note - The grade of gold coins is 900 per 1000 pure gold and 100 per 1000 copper. Article 4- The maximum weight and purity uncertainty of each gold coin have to be 0.002. Article 5- Coin shape a- All the coins mentioned above are round. b- Gold coins have on one side the image of H.I.M the king of Iran and on the other