Ob. CONSTANTINVS IVN N C Laureate, draped bust seen from behind.
Rev. PRINCIPIA IVVENTVTIS Prince standing right, leaning on reversed spear, hand resting on shield.
London Mint - crescent in left field, PLN in exergue.
RIC --, Toone (prelim.) --.
After RIC 136, after Toone (prelim) 182.
This obverse legend is unpublished and unlisted for PRINCIPIA for this crescent issue. It is, however, known for the corresponding CLARITAS and SOLI types, so is to be expected.