Not something I normally deal with. This is from my own collection. I haven't collected coins or medals for about 45 years.

Charles II , Peace of Breda, 1667, silver medal by John Roettiers.
Commemorating the Treaty of Breda, 31 July 1667.

 Obv:
Laureate bust  right.
(star) CAROLVS - SECVNDVS - DEI - GRATIA - MAG - BRI -  FRAN - ET - HIB - REX,

Rev:
FAVENTE DEO (By God's favour)
Britannia seated on rocky shore, contemplating her navies, BRITANNIA in exergue.

Edge: (rose) + (rose) CAROLVS (star) SECVNDVS (star) PACIS (star) ET (star) IMPERII (star) RESTITVOR (star) AVGVSTVS
(Charles II, august restorer of peace and of the Empire).

 Van Loon II p. 522; MI 535/186; Eimer 241.

 56mm.

 Some bruising, scattered tiny marks, and knocks on the edge (see photos) all in all about Very Fine.

Interesting side notes:

The great diarist Samuel Pepys recorded that she was the greatest beauty he ever saw. She had numerous suitors, including the Duke of Buckingham and Francis Digby, son of the Earl of Bristol, whose unrequited love for her was celebrated by Dryden. Also Charles himself.

 
Samuel Pepys saw the on 25 February 1667 and recorded in his diary :
'At my goldsmith’s did observe the King’s new Medall [sic], where in little there is Mrs Steward's [sic] face, as well done as ever I saw anything in my whole life I think  and a pretty thing it is that he should choose her face to represent Britannia by'

 It is said that at this time the King is shamelessly (and unsuccessfully) attempting to manoeuvre the beautiful Frances Stewart/Stuart into his bed.
Having her pose as Britannia for this medal was supposed to help charm her into succumbing. It didn't.
Frances Teresa Stewart, Duchess of Richmond and Lennox (8 July 1647[1] – 15 October 1702) was a prominent member of the Court of the Restoration and known for her great beauty as 'La Belle Stuart' She is said to have served as the model for an idealised, female Britannia which appeared on so many British coins thereafter.

Signed at the Dutch city of Breda on 31 July 1667, the Treaty of Breda brought the Second Anglo-Dutch War (1665-1667) to a hasty end due to the invasion of the Southern Netherlands by Louis XIV. Prompted by Michiel de Ruyter’s successful Raid on the Medway a little more than a month earlier, which gave the Dutch control of the seas around the southern coast of England, the English quickly sued for peace. Under the terms of the treaty, the Dutch East India Company secured its control of the East Indies and the lucrative worldwide trade in nutmeg. They also gained concessions to the English Navigation Acts, which now allowed them to import German goods into England. In the long term, however, the treaty provided England with the opportunity to expand its overseas empire in North America. The unwillingness of the Dutch to recover Nieuw-Nederland, taken by the English in 1664 (its restoration had been an English concession to peace), now gave England full control of several new colonies (New York, New Jersey, Delaware, and Pennsylvania), as well as the city of Nieuw-Amsterdam - now renamed New York City. The restoration of Acadia by the English to the French foreshadowed the series of wars that would be fought between the two powers for dominance in North American theatre, culminating in the French and Indian War (1754-1763).