English: IRAN: Nasir al-Din Shah, 1848-1896, AE 50 dinars, AH1294, KM-883, pattern date with dies engraved by Franz Pechan (FP), an official from the Vienna Mint, cleaned, EF. The Iranian Imperial Postal Service was reorganized successfully by Gustav Riederer von Dachsberg, and the Tehran Mint by Franz Pechan von Prägenberg, though this latter reorganization was only initially successful. The new Tehran Mint was founded in 1877 as the sole national mint of Iran; it replaced multiple provincial mints. It was constructed at the place of a former cotton factory in northern Tehran, and used French machinery, while the original building was built by the Belgians. Senior Münze Österreich official, Franz Pechan von Prägenberg, contributed to technically operate the mint. When he was ordered to reduce the standard of the coins, he quit the service.