Scyphate

The curious seal, now for the first time published, presents an example of the scyphate, or dished form, which is of rare occurrence.

Source: wiktionary

In the later reigns, a coinage of small bronze pieces, slightly scyphate, accompany the aspers.

Source: wiktionary

Further, atleast^([sic]) some of the coins are slightly scyphate also. However, it is not certain whether these were intentionally made scyphate or the shape was simply a result of punching process or the wooden anvil having become slightly scyphate due to repeated use.

Source: wiktionary

The hoard from Tepe Maranjan near Kabul (Curiel, 1953: 101–131) containing 368 Sasanian silver drachms—326 of Shapur II, 28 of Ardeshir II and 14 of Shapur III (a.d. 383–388) with 12 gold Kushano-Sasanian scyphates, provides important evidence for the previous metal currency of eastern Afghanistan, the dating of the Kushano-Sasanian gold coinage and the chronology of Kidara who became king of the southern Kushan provinces.

Source: wiktionary