1 Tumân - Moḥammad Qājār Type S, Shīrāz mint

The Qajar monetary system underwent repeated recalibration during Mohammad Shah's reign, with the tumân serving as the primary gold unit in a bimetallic structure that was perpetually undermined by inconsistent provincial minting. Shīrāz, as the administrative capital of Fārs province, operated its own mint with some autonomy, and weight standards across issues from this period vary enough that individual pieces frequently diverge from nominal specifications.

Mohammad Shah's reign coincided with growing Russian and British pressure over Afghan affairs, culminating in the disastrous 1838–1839 siege of Herat, which forced a Persian withdrawal under British threat. The fiscal strain of that campaign left its mark on provincial minting schedules throughout the early 1840s.