Here is one that most collectors probably are not aware of. This is from Sogdiana which was at the crossroads of the Silk Trade Route. A very interesting culture that had elements of Indian, Greek, Chinese and Arabic:
Sogdiana, Principality of Samitan: Nanaiabiat Samidanian (ca. 700-800 CE) AE Cash (Fedorov: pl. 24, 1-6)
Obv: Sogdian legend around square hole, which can be translated as 'Nanaiabiat Samidanian', Samidan being the town's name, Nanaiabiat the ruler.
Rev: Tamgha each side of square hole. The identical tamghas are in the form of a semi-circle on a pedestal; small annulet in semi-circle.
Reference
Fedorov, M., & Kuznetsov, A. (2010).
A Hoard of Early Medieval Sogdian Bronze Coins from the Ming Tepe Hillfort. The Numismatic Chronicle, 170, 446-451.