ABBASID: 'Ali Ibn 'Isa (799-806), AR Dirham (2.85g), Balkh, AH 190. Citing 'Ali Ibn 'Isa as "mawla" without citing neither the caliph nor any of his potential heirs. A-219H. Extremely fine to about uncirculated. Very rare or extremely rare.
This piece has apparently appeared twice only in recent years, once in Stephen Album's Auction 18 (sold for $410) and for the second time in Baldwin's Islamic Auction 24 (sold for around $500).