Watch List notes:

USA (Philadelphia mint), half dollar seated Liberty, 1840, encased in Lucite with a brass button, a brass tack, a brass ring, an encrusted coin (black) and some shells. 499 grams, 3-1/2" x 3-1/2" x 2". The main coin with UNC details but areas of edge lost to corrosion, the other coin completely cocooned in black oxidation, the three brass pieces all more or less intact, overall a neat promotional display, surely worth more than the sum of its parts. With wooden stand and box, plus original, hand-signed certificate of authenticity #08-362. S.S. New York, sunk in 1846 in the Gulf of Mexico

Estimate: $400-600