Ottoman Empire – Mustafa III (1757–1774) Silver (billon) Piaster (Kuruş), AH 1171 / regnal year 8 (1764–1765) Constantinople (Islambol) mint Weight: 18.981 g Diameter: 39.05 mm Obverse: Tughra of Sultan Mustafa III, surrounded by a decorative pearl border. Reverse: Arabic inscription in two lines, including regnal year (8) and mint name Islambol, with accession date AH 1171. Classification & References: • KM #313 (variant; comparable to KM #321 series) • Standard Ottoman silver/billon Kuruş type • Mint: Constantinople (Istanbul) • Composition: billon (~0.400–0.465 silver typical for the type) Technical details (type standard): • Typical weight range: 18.4–19.9 g • Typical diameter: 38–39 mm Condition: Good Very Fine (GVF) Well-preserved details with clear legends. Attractive light toning. Comment: A large and impressive Ottoman silver coin of Mustafa III, struck during a period of monetary reform and active circulation across the empire. Broad flan and strong calligraphy make this type particularly desirable among collectors of Islamic and Ottoman coinage.