54.6 millimeters. 66.3 grams. Obv: conjoined busts of King James II and Queen Mary, legend around. Rev: recovery operation of Spanish treasure ship Nuestro Senora dela Concepcion off the silver shoals near Santa Domingo with the recovery ship Alger Rose in the distance. Light, original toning with the rim distress typical of the issue evident on the reverse.
These medals were presented to William Phipps, the commander of the project, as well as to crew members and financial backers of the recovery effort. The silver in the medal no doubt from metal salvaged at the site.