Watch List notes:

Mainz, Emerich Joseph Breitbach von Bürresheim (1763-74), Installation as Bishop of Worms, 1768, silver medal, by A.F. Stieler, bust right, rev., Providentia seated, basilisk to right, chronogrammatic date around, 42.4mm, 29.12g, virtually mint state

Estimate: 300-350 GBP