Probably a Commodus AE sestertius.
M COMMODVS - ANTONINVS AVG, laureate bust r.,
(TR P V IMP IIII COS II P P), Commodus seated l. on platform; on r., officer; on l., Liberalitas standing l., holding tessera and cornucopiae; on l., citizen mounting r. on platform; in field, (S - C); in exergue LIBERALITAS / (AVG.) RIC 300
Like this one:-

I am not sure what your expectations are but the coin I have illustrated retails for < £200.
M COMMODVS - ANTONINVS AVG, laureate bust r.,
(TR P V IMP IIII COS II P P), Commodus seated l. on platform; on r., officer; on l., Liberalitas standing l., holding tessera and cornucopiae; on l., citizen mounting r. on platform; in field, (S - C); in exergue LIBERALITAS / (AVG.) RIC 300
Like this one:-

I am not sure what your expectations are but the coin I have illustrated retails for < £200.

























