Watch List notes:

Charles II (1660-1686), British Colonisation 1670, Silver Medal by J Roettier. Conjoined busts of Charles II and Catherine of Braganza r., rev. Globe, DIFFVSVS IN ORBE BRITANNVS 1670 around - Britannia Spread over the World. 41.5mm/34.17gm. (MI i 546/202; E 245; Betts 44). Almost Extremely Fine, a few minor marks – one below tip of Africa, original lustre in protected areas of field. Also, a little cabinet friction on very salient points.

Ex. Tim Millet.
Medallic Illustrations suggests this medal possibly refers to the dowry brought with Charles's marriage to Catherine, which laid the foundation of the British Empire in India. However, it more likely to refer to the acquisition of territory, notably in North America and Asia.