A medal, token or good luck talisman for those embarking on a journey, especially at sea.
It comes in various forms and metals, but always of the same type. On one side St. George defeating a dragon, on the other a sailing boat on rough waters.
Pieces whose size and appearance correlate with thaler coins (like this one) were sometimes called "St. George's Thalers."
IN TEMPESTATE SECVRITAS / S GEORGIVS EQVITVM PATRONVS
Trace of a pendant at 12 o'clock.
Cast in brass, silver-plated; diameter 41 mm, weight 20.92 g.