RIC Rarity Scale (Volume VII)
r5 — unique
r4 — 2–3 coins known
r3 — 4–6 coins known
r2 — 7–10 coins known
r1 — 11–15 coins known
These rarity values follow Roman Imperial Coinage Volume VII. Although this volume has not been revised for many years, it remains one of the most respected references available. The rarity ratings should therefore be treated as a useful guide rather than an absolute measure, as additional specimens may have surfaced since publication.