Laureate head of Pertinax, right., Pertinax, togate, seated left on curule chair set on platform, extending right hand and holding roll in left hand at side; behind him, officer holding staff in left hand; on steps of platform, citizen, togate, standing right, holding out fold of toga; in background, Liberalitas, draped, standing left, holding abacus in right hand and cornucopiae in left hand, Sestertius of the highest rarity ! With a magnificent natural brown patina! Struck in the name of Pertinax, one of the transitional emperors between the Antonine and Severan dynasties, he reigned for only a few months, between 1 January and 28 March. It is the day of his assassination by the Praetorian Guard, whose favour he thought he had won by promising them a "donativvm", a donation of money, in exchange for their support in his accession to the throne. Here, the coin represents the congiarium, a donation for the benefit of the citizens organised during celebrations. We know from the Historia Augusta that he organised several congiarium, and this coin probably celebrates one of them. The rarity of this coin resides in the fact that very few coins were struck by this emperor, who reigned for only a few months, combined with the celebrated event for which it was struck, so much so that only one example is known to exist in public collections, in the British Museum!, IMP CAES P HELV PERTINAX AVG, TR P COS II S - C // LIB AVG