Watch List notes:

SUDAN: al-Mahdi, 1881-1885, AR 20 piastres (22.36g), NM, AH1302 year 5, KM-2, darb fi al-hajrih 1302 "struck in [year] hijra 1302, actually struck at Omdurman, lightly cleaned, PCGS graded VF details, R. Only large silver issue of the 'Mahdi' and rare. Struck in the year of the fall of Khartoum and the Mahdi's unexpected death six months later.

Estimate: 800-1,000 USD