The Nummus denomination
The nummus was a diminutive denomination introduced around 379 AD. It measured less than 17 mm, and weighed around 1 gram. The name nummus is almost certainly a misattribution, as recent evidence suggests that what we call a 'follis' was actually referred to as a 'nummus'.

As the disastrous 5th Century progressed, the "nummus" was to become the only bronze denomination in circulation.

By this time, the quality of Roman coinage has declined so much that official issues are frequently indistinguishable from the imitations produced by the hordes of barbarians which now occupied most of the empire.

Sic transit gloria mundi.
Nummus
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An AE Nummus struck AD 319-320 in Londinium
Obverse: IMP CONSTANTINVS AG, cuirassed bust left, wearing high-crested helmet and holding spear over right shoulder

Reverse: VICTORIAE LAETAE PRINC PERP, two Victories standing facing each other, holding between them shield, inscribed VOT PR in two lines, resting on altar ornamented with diamond pattern; five dots within, PLN in exergue

Diameter: 19 mm
Die Orientation: 6 H
Weight: 2.47 g
No notes for this coin
RIC 159; Sear 16296
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An AE Nummus struck c. AD 321-323 in Londinium
Obverse: CONSTAN-TINVS AVG, laureate and trabeate bust right, holding eagle-tipped sceptre

Reverse: BEAT TRA-NQLITAS, globe set upon altar inscribed VOT/IS/XX; three stars above, PLON in exergue

Diameter: 19 mm
Die Orientation: 5 H
Weight: 2.96 g
No notes for this coin
CT 9.05.008; RIC 267; Sear 16170
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An AE Nummus struck 319 AD in Siscia
Obverse: CONSTANTI-NVS AVG: Bust of Constantine I, wearing high-crested helmet, cuirassed, left, spear across right shoulder and shield on left arm

Reverse: VICT • LAETAE PRINC PERP: Two Victories, winged, draped, facing each other, holding a shield inscribed VOT/PR supported by S on altar MintMark: -/-//•ΓSIS•

Diameter: 19 mm
Die Orientation: -
Weight: 2.75 g
No notes for this coin
RIC VII Siscia 84
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An AE Nummus struck AD 330-335 in Antioch
Obverse: VRBS ROMA, helmeted bust of Roma left, wearing imperial mantle

Reverse: She-wolf standing left, suckling Romulus and Remus; two stars above, SMANΘ in exergue

Diameter: 18 mm
Die Orientation: 5 H
Weight: 2.94 g
No notes for this coin
RIC 91
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An AE Nummus struck AD 312-313 in Londinium
Obverse: CONSTANTINVS P AVG, laureate, helmeted, draped and cuirassed bust left, right hand holding spear forward and shield on left arm

Reverse: SECVRITAS AVGG, Securitas standing facing, head left, legs crossed, with right hand on head and left arm leaning on column; star in left field, PLN in exergue

Diameter: 21 mm
Die Orientation: 6 H
Weight: 3.61 g
This coin was part of a hoard of 3,442 coins discovered on the 22nd March 1970 by a detectorist just south of the village of Bourton-on-the-Water in Gloucestershire, England. Archaeological evidence indicates the presence of a Roman settlement nearby; the village was located on a major Roman road, the Fosse way linking Cirencester to Leicester, and would have been an ideal location for a posting station. The main hoard, containing 2,707 coins, was found in a field adjoining the Fosse Way and hidden 45cm below ground level. It was beneath flat stones and in a spherical mass that suggested their owner had buried them inside a bag. A further 735 coins were found scattered in the vicinity. The hoard consisted mainly of coins of Constantine I, and over half of the coins in the hoard (1,882) were struck at the London mint. The coin types present suggest that the hoard was assembled early in the reign of Constantine I, sometime between AD 317 and 319. This particular coin is rare, and the only one of it’s type in the BoW hoard. For another example, struck from the same dies, see CNG Mail Bid Sale 75; Lot 1139.
CT 7.13.004; RIC 278 var. (bust type); Sear 16040 (note)
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An AE Nummus struck c. AD 314 in Londinium
Obverse: IMP CONSTANTINVS P AVG, laureate and cuirassed bust right

Reverse: SOLI INVICTO COMITI, Sol standing left with chlamys across left shoulder, right hand raised, left hand holding globe; S in left field, F in right field, PLN in exergue

Diameter: 21 mm
Die Orientation: 6 H
Weight: 3.83 g
This coin was part of a hoard of 3,442 coins discovered on the 22nd March 1970 by a detectorist just south of the village of Bourton-on-the-Water in Gloucestershire, England. Archaeological evidence indicates the presence of a Roman settlement nearby; the village was located on a major Roman road, the Fosse way linking Cirencester to Leicester, and would have been an ideal location for a posting station. The main hoard, containing 2,707 coins, was found in a field adjoining the Fosse Way and hidden 45cm below ground level. It was beneath flat stones and in a spherical mass that suggested their owner had buried them inside a bag. A further 735 coins were found scattered in the vicinity. The hoard consisted mainly of coins of Constantine I, and over half of the coins in the hoard (1,882) were struck at the London mint. The coin types present suggest that the hoard was assembled early in the reign of Constantine I, sometime between AD 317 and 319. This particular coin was one of 19 examples of the type in the hoard, and is in a far better state of preservation than the majority of the coins discovered.
RIC 8; CT 8.02.013; Sear 16050
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An AE Nummus struck AD 322-323 in Londinium
Obverse: CONSTANTINVS IVN N C, helmeted and cuirassed bust left

Reverse: BEAT TRANQLITAS, globe on altar inscribed VOTIS XX in three lines; three stars above, PLON in exergue

Diameter: 19 mm
Die Orientation: 6 H
Weight: 3.82 g
No notes for this coin
RIC 287; Sear 17149
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An AE Nummus struck AD 330-333 in Constantinople
Obverse: CONSTANTINVS IVN NOB C, laureate and cuirassed bust right

Reverse: GLOR-IA EXERC-ITVS, Two soldiers standing facing each other, each resting on spear and shield, two standards between them; CONSΓ in exergue

Diameter: 17 mm
Die Orientation: 6 H
Weight: 2.4 g
No notes for this coin
RIC 60; Sear 17338
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An AE Nummus struck AD 353-355 in Siscia
Obverse: D N CONSTANTIVS P F AVG, diademed, draped and cuirassed bust right

Reverse: FEL TEMP REPARATIO, soldier left, spearing fallen horseman, shield on ground to right; ASIS (reverse Z) in exergue

Diameter: 17 mm
Die Orientation: 1 H
Weight: 2.17 g
No notes for this coin
RIC 352; LRBC 1222; Sear 18271
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An AE Nummus struck 324-361 A.D. in Siscia
Obverse: FL IVL CONSTANTIVS NOB C, laureate, cuirassed bust right

Reverse: GLORIA EXERCITVS, two soldiers flanking two standards.

Diameter: 18.5 mm
Die Orientation: 0 H
Weight: 1.82 g

5

RIC VII 237
(11) Crispus
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An AE Nummus struck AD 317 in Londinium
Obverse: CRISPVS NOB CAES, laureate, draped and cuirassed bust right

Reverse: SOLI INVIC-TO COMITI, Sol standing left, chlamys across left shoulder, right hand raised, left hand holding up globe; S-P across fields, PLN in exergue

Diameter: 20 mm
Die Orientation: 6 H
Weight: 3.32 g
This coin was purchased directly from Lee Toone, author of LMCC, and is one of the plate coins from his book. He informed me that the coin originally came from a large French hoard.
CT 8.09.021 (this coin); RIC 116; Sear 16718
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An AE Nummus struck 421-450 in Rome
Obverse: [DN GALLA PLACIDIA PF AVG] Diademed and draped bust of Galla Placidia to right

Reverse: SALVS REI P[VBLICE] / RM Cross; in field to left, Є

Diameter: 12.5 mm
Die Orientation: 12 H
Weight: 1.7 g
No notes for this coin
RIC 2111
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An AE Nummus struck AD 336-337 in Constantinople
Obverse: FL HANNIBALLIANO REGI, bare-headed, draped and cuirassed bust right

Reverse: SECVRITAS PVBLICA, Euphrates seated right on ground, leaning on sceptre with urn at his side and reed in background; CONSS in exergue

Diameter: 16 mm
Die Orientation: 5 H
Weight: 1.44 g
No notes for this coin
RIC 147; LRBC 1036
(14) Helena
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An AE Nummus struck AD 326-328 in Thessalonica
Obverse: FL HELENA AVGVSTA, diademed and mantled bust right, wearing necklace

Reverse: SECVRITAS REIPVBLICE, Securitas standing left, lowering branch and raising robe with right hand; SMTSΓ in exergue

Diameter: 19 mm
Die Orientation: 5 H
Weight: 3.35 g
No notes for this coin
RIC 159 (Constantine I); Sear 16612
(15) Johannes
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An AE Nummus struck 423-425 in Rome
Obverse: (DN IOHAN-NES PF AVG), pearl-diademed, draped and cuirassed bust right

Reverse: VICTOR-IA AVGG, Victory walking left, holding wreath and palm, Epsilon in left field

Diameter: 10 mm
Die Orientation: -
Weight: 1.5 g
Mintmark is off flan
RIC X 1910
(16) Johannes
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An AE Nummus struck 423-425 in Rome
Obverse: DN IOHANN-ES PF AVG, Pearl-diademed, draped and cuirassed bust right

Reverse: SALVS REI-PVBLICAE, Victory walking left, holding trophy over shoulder and dragging captive. Epsilon in left field

Diameter: 12 mm
Die Orientation: -
Weight: 1 g
No notes for this coin
RIC x 1916, Sear 21121
(17) Leo I | Verina
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An AE Nummus struck AD 467-472 in an unknown location
Obverse: DN LEO (?), Head of Leo right

Reverse: Verina standing, facing, holding a transverse scepter "b-E"

Diameter: 11 mm
Die Orientation: 0 H
Weight: 1.2 g
No notes for this coin
RIC X 713-718
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An AE Nummus struck 450-457 AD in Thessalonica
Obverse: DN MARCIANVS PF AVG, Pearl diademed, draped, and cuirassed bust right

Reverse: Monogram 1B within wreath

Diameter: 10 mm
Die Orientation: 0 H
Weight: 1.18 g
No notes for this coin
RIC X 535
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An AE Nummus struck 425-455 AD in Rome
Obverse: DN VALENTINIANVS PF AVG, Pearl diademed, draped, and cuirassed bust right.

Reverse: VICTORIA AVGG, Victory advancing left holding wreath, T in left field

Diameter: 14 mm
Die Orientation: 0 H
Weight: 1.8 g

Rare

RIC 2121
(20) Zeno
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An AE Nummus struck 476-791 in Constantinople
Obverse: Laureate, draped bust right

Reverse: Type 5 Monogram

Diameter: 0.9 mm
Die Orientation: -
Weight: 1.4 g
No notes for this coin
RIC X 962