Antoninianus - Probus Imperial mantle, left, sceptre surmounted by eagle; CONCORD MILIT; Concordia

Reverse

Probus, standing right, clasping hands with Concordia, standing left.
Officina mark (P), value mark (XX) and mintmark (T) in exergue, sometimes star (✶) in field.

Script: Latin

Lettering: CONCORD MILIT

Unabridged legend: Concordia Militum.

Translation: Harmony with the soldiers.

Comment

RIC 332 was minted by the 1^th officina (PXXT) of the Ticinum mint (PXXT). The XX stands for 20 parts alloy (instead of the more usual XXI for a copper to silver ratio of 20:1). The original RIC text mentions 4 variations/different bust types (bust types according to Pierre Bastiens grouping of bust types; see illustrated: probvs.net), and also two variants are known to exist:

1. Radiate, draped and cuirassed, right (A2 bust, example: probuscoins.fr #332, Numista N# 292680);
2. Radiate, cuirassed, right (B bust, example: probuscoins.fr #2426, Numista N# 293439);
3. Radiate, wearing imperial mantle, left, holding sceptre surmounted by eagle in right hand (H2 bust, example: probuscoins.fr #332, Numista N# 293440);
4. Radiate, cuirassed, left, with spear and shield, seen from back (F8 bust, example: probuscoins.fr #981, Numista N# 293441); 
5. [var] Helmeted, radiate, cuirassed, left, holding spear in right hand and shield in left hand (E1 bust, example: probuscoins.fr #4689, not in Numista);
6. [var] Helmeted, radiate, cuirassed, left, holding spear in right hand and shield in left hand, seen from back (E2 bust, example: Auction 130 Numismatik Naumann, lot 718, not in Numista).

According to Pink, RIC 332 – with its obverse lettering Nr. 1 (‘IMP C M AVR PROBVS AVG’) combined with “CONCORD MILIT” and exergue mark PXXT – is part of the 2^nd emission (year 276) and 3^rd emission (277). See: Karl Pink, Der Aufbau der römischen Münzprägung in der Kaiserzeit VI/I, Wien, 1949, p. 48-49. According to Pink, the A2 and B bust were used during the 2^nd emission sometimes combined with a star (✶) in field and during the 3^rd emission only the H2 bust was used and the star (✶) was used this emission as well (and then only again in the 10^th emission when RIC 332 was not minted). Although not listed by Pink, coins with the remaining busts (F8, E1 and E2) are also of the 3^rd emission, because these busts were used in that 3^rd emission and not at all during the 2^nd emission.

Interesting fact