How to Identify the Islamic Silver Dirham (Abbasid)

What It Is

The Abbasid silver dirham was struck across the vast Abbasid Caliphate (750-1258 AD) following the same aniconic, text-only design philosophy established by the earlier Umayyad reform. Because Abbasid mints operated across a huge territory from North Africa to Central Asia, dirhams survive today in large quantities and with great mint and date variety.

Obverse Design

Like its gold dinar counterpart, the dirham's obverse center carries a religious inscription, most often the Shahada, framed in one or more concentric circles of small Kufic script. Later Abbasid issues frequently add the name of the reigning caliph or an appointed heir in the outer margin or in an added line of text within the field.

Reverse Design

The reverse typically continues with a statement referencing the Prophet Muhammad and his prophetic mission, along with the essential identifying details for collectors: the mint city and the Hijri year of striking, spelled out in the margin. Many Abbasid dirhams also name a provincial governor or high official, useful for narrowing down attribution.

Size, Weight, and Metal

Dirhams are struck in silver on a broad, thin flan, typically 24-28mm across but weighing only about 2.9-3.0 grams, giving them a light, delicate feel relative to their visual size. The edge is plain and irregular, consistent with hand striking.

Mint Marks and Dates

The mint city name and Hijri date are typically the most valuable identifying features and usually sit in the reverse margin. Because the Abbasid Caliphate operated dozens of regional mints (Baghdad, Basra, Samarqand, al-Andalus under earlier Umayyad rule, and many others), cross-referencing the named city and year is the standard way specialists pin down exactly when and where a given dirham was struck.

Telling It Apart From Similar Coins

Abbasid dirhams can be distinguished from Umayyad-era dirhams mainly by caliph or governor names and by mint cities that only came into use after 750 AD, as well as by certain added phrases (such as references to specific viziers) unique to the Abbasid administration. Compared to later Islamic dynastic coinages (Samanid, Buyid, Fatimid, etc.), Abbasid dirhams generally retain the simpler, purely epigraphic layout without added dynastic symbols or tughras that appear on some later regional issues.

Judging Condition at a Glance

Since there is no portrait to judge wear against, condition is assessed by how legible and complete the Kufic script remains, especially the mint and date line, which is often the first area to weaken from wear or an off-center strike. A dirham with clear, fully readable margins is considered notably better for identification purposes than one with worn or partially struck edges.

Authenticity Red Flags

Be alert to dirhams with an implausible mint-and-date combination (a city named that did not operate under Abbasid control in the stated year), inconsistent or anachronistic script style, an unusually light or heavy weight compared to the roughly 2.9-3.0 gram standard, or overly clean, mechanically uniform lettering suggesting a modern-made replica rather than a hand-cut ancient die.