Zeri Mahbub - Mustafa III Islambol mint

The Zeri Mahbub — literally "beloved gold" — was introduced in the early eighteenth century as the Ottoman Empire's workhorse gold denomination, circulating widely across the Levant and Egypt where it often traded at a premium over its face value in local exchange. Mustafa III's reign coincided with catastrophic military reversals against Russia, culminating in the 1768–1774 war that would end with the Treaty of Küçük Kaynarca and force the empire's first major territorial concessions to a Christian power.

The Islambol mint — the official Ottoman rendering of Istanbul — struck these consistently throughout the period, though output fluctuated sharply as war expenses strained the imperial treasury.