English:

17th century royal coat of arms within Petersfield Museum, Hampshire. Petersfield Museum is housed in the town's old courthouse and police station. Coat of arms of Kings Charles II and King James II, differenced by a baton sinister argent, denoting bastardy. Thus it is the coat of arms of one of the illegitimate sons of either King Charles II (1660-1685) of England, or of his younger brother and successor, James II (1685-1688). Possibly for the eldest son of Charles II, namely James Scott, 1st Duke of Monmouth, 1st Duke of Buccleuch, who used a baton sinister argent, later with an inescutcheon of Scott (of Buccleuch) over it. The Latin motto Per Mare Per Terras ("by sea, by lands") appears to be that of the Royal Marines (usually given in the singular as Per Mare Per Terram("by sea, by land")), founded by the Duke of York and Albany (later James II of England) in 1664. James II, younger brother of King Charles II, also had illegitimate sons, to whom these arms might therefore relate. Text from museum's website[1]: "The mystery of the Coat of Arms. The coat of arms used to hang over the mantlepiece in the Magistrate’s retiring room" (the museum building used to be used as a courthouse) "When it was restored by Hampshire Museum Service it was discovered that it was a duke’s coat of arms. The unicorn had paws, not hooves, as it was originally a greyhound with the unicorn’s head being added later. Investigations by the College of Arms in London revealed that the baton across the centre was used as a mark of esteem" (sic, should be "mark of difference") "for the illegitimate children of Charles II. Yet even with this new information, we still do not know who the coat of arms belonged to as its motto is written over an older original, which has no connection with a Duke’s arms."