Watch List notes:

Diocletian (284-305), so-called "Antoninianus", Siscia, AD 293-294; AE (g 3,83; mm 20; h 1); IMP C DIOCLETIANVS AVG, radiate, draped and cuirassed bust r., Rv. PREAESID - IA REIPVBLIC, emperor standing r., holding spear and shield; before, captive; in ex. [X]XI. RIC -; C -; D. Margetic, Praesidia reipvblic and the last emission of antoniniani at the mint of Siscia, "Journal of the Zagreb Archaeological Museum" 45.1, may 2013, pp. 359-368, n. 1.
Extremely rare, good extremely fine.