| Codice di rarità | Grado di rarità | |
| C3 | Extremely common, usually ten-times as frequently encountered (in hoards or finds) as coins listed as "C" | |
| C2 | Very common, at list twice as frequently encountered (in hoards or finds) as coins listed as "C" | |
| C (common) | Examples in most public collections, frequently seen in hoard surveys (precious metal) or compilation of site finds (aes) | |
| R (rare) | Several specimens known in major museum collections, only occasional examples recorded in hoard surveys (precious metal) or compilation of site finds (aes) | |
| R2 | Very few examples known, or, if a die study exists, very few (1-3) die-combinations known | |
| R3 | Only one example known to us | |
| (*) From RIC II, Edizione dic. 2007, pag. xxii | ||