The Post-reform Radiate denomination
The Post-reform Radiate (Latin name unknown) was a Roman coin denomination first issued by Diocletian during his currency reforms.

The radiate looked very similar to the Antoninianus (pre-reform radiate), with a radiate crown like Sol Invictus. The difference is the absence of the "XXI" that existed on pre-reform radiates, a symbol believed to have indicated a consistence of 20 parts bronze to 1 part silver. The post-reform radiate had little or no silver content. The weight varies between 2.23 and 3.44 grams.

It was struck under Diocletian, Maximian, Constantius I, and Galerius.
Post-reform Radiate
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An AE Post-reform Radiate struck 295-296 AD in Heraclea
Obverse: radiate, cuirassed bust right; FL VAL CONSTANTIVS NOB CAES

Reverse: Constantius I standing right on left, holding scepter, receiving Victory on globe from Jupiter to right, holding scepter; CONCORDIA MILI_TVM / HB

Diameter: -
Die Orientation: -
Weight: 2.1 g
No notes for this coin
RIC VI Heraclea 15
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An AE Post-reform Radiate struck c. 295-299 AD in Cyzicus
Obverse: radiate, draped and cuirassed bust right; IMP C C VAL DIOCLETIANVS P F AVG

Reverse: Diocletian standing right, holding parazonium, receiving Victory on globe from Jupiter standing left holding long scepter; CONCORDIA MI_LITVM / KΓ

Diameter: -
Die Orientation: -
Weight: 3 g
No notes for this coin
RIC VI Cyzicus 16a
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An AE Post-reform Radiate struck 303 AD in Carthage
Obverse: Radiate, draped and cuirassed bust right from behind; GAL VAL MAXIMIANVS NOB C

Reverse: Legend within wreath; VOT / X / F K

Diameter: -
Die Orientation: -
Weight: 3.1 g
scarce
RIC VI Carthage 36
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An AE Post-reform Radiate struck 299 AD in Ticinum
Obverse: radiate, cuirassed bust right; GAL VAL MAXIMIANVS NOB C

Reverse: legend within wreath; VOT / . / X / T

Diameter: 21 mm
Die Orientation: -
Weight: 3.73 g
No notes for this coin
RIC VI Ticinum 39b
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An AE Post-reform Radiate struck AD 306-307 in Alexandria
Obverse: IMP C SEVERVS P F AVG, radiate, draped and cuirassed bust right

Reverse: CONCORDIA MILITVM, Severus standing right, holding short sceptre and receiving Victory on globe from Jupiter standing left, holding sceptre; Δ in central field, ALE in exergue

Diameter: 20 mm
Die Orientation: 11 H
Weight: 2.97 g
This coin is currently listed for sale via my Ebay page: https://www.ebay.co.uk/usr/closer-2-heaven
RIC 84; Sear 14682