Watch List notes:

VIETNAM: NGUYEN DYNASTY (DAI NAM): Tu Duc, 1848-1883, AV tien (3.53g), cf. KM-412, Sch-364, eight precious symbols around the center hole on reverse, apparently unpublished in gold and extremely rare, EF, RRR, ex M. Louis Teller Numismatic Company.

Estimate: 2,000-3,000 USD