Ḥājj Muḥammad Ḥusayn Mahdavī Amīn al-Ḍarb (Zarb) II (1289-1351/1872-1932) was the only surviving son of Ḥājj Muḥammad Ḥasan Amīn al-Ḍarb (Zarb) (1250-1316/1834-1898), the first major Iranian entrepreneur and Master of the Mint under Naṣīr al-Dīn Shāh Qājār (r. 1264-1313/1848-1896). A businessman active in the Iranian Constitutional Revolution of 1906, which marked a period of transition from despotism to democracy and the establishment of the first constitution in Iran, Ḥājj Muḥammad Ḥusayn was vice-president of the first majlis (