The seals were produced during the Achaemenid Empire (c. 705-330 BC), also known as the First Persian Empire, and the Sasanian Empire (c. 224-651 AD), the fourth Iranian dynasty and Iran's last pre-Islamic empire.
The priceless seals and some other artefacts were handed over by the US after a Supreme Court decision to return them to their place of origin, and they were given to Iranian representatives on the sidelines of a UN meeting earlier this month.
On May 7 they arrived at the museum in Tehran, and will go on display there on May 20.
دانشگاه شرقشناسی شیکاگو آماده تحویل الواح هخامنشی به ایران است. این الواح اکنون در دیوان عالی کشور آمریکا قرار دارد pic.twitter.com/Xm6UMcopF5— sabz (@777sabz) 18 мая 2016 г.
In summer 2015 Italy returned 30 artefacts to Iran which had been illegally taken to Europe over the preceding ten years. They had been discovered by Italian police and delivered to the Iranian embassy in Italy.
In December 2014 a collection of 300 items dating back more than 3,000 years, which had spent 50 years in Belgium, also returned to Tehran after a court ruling.