Watch List notes:

(g) Muscat & Oman, Sultan Sa'id bin Taimur (1932-70), gold proof Saidi Rial, AH1378 (1958), in original red presentation box (KM 31b), fields lightly polished but otherwise proof uncirculated, a key date with very limited mintage.
Low mintage of only 100 coins.
Estimate: £2500 - £3000