Watch List notes:

(g) Oman, Sultanate, Qabus bin Sa'id (1970- ), proof gold piedfort Quarter-Omani Rial, 13.77g, AH1397 (1976), fortress of al-Hazam, in original red presentation box (KM 57), proof uncirculated.
Low mintage, only 1000 struck.
Estimate: £750 - £900