Yemen
al-Nasir Ahmad bin Yahya (Imam Ahmad) 1/80 Riyal AH 1378 (1959) MS66 Red PCGS, KM-Y11.1. Crescent below accession date AH1367 which may vary as 1367/1267, 1367/1777, etc. / Sana above date.
From A Special Selection of World Coins
HID02901242017
Estimate: 80-120 USD