Constantius I Chlorus mule antoninianus?

[Luuk S]

Hi all

Today i received this nice antoninianus of Constantius I Chlorus. However, i cannot find the reverse in the literature
I think it might be a mule with Diocletian RIC 166. Let me know what you think!

gr Luuk

Obverse: FL VAL CONSTANTIVS NOB C, radiated bust to right
Reverse: IOVI CONSERVAT AVGG, Jupiter looking right, holding thunderbolts and spear. Eagle at feet.
Exergue: XXIZ
Mint: Rome
Year: ca 293 AD
Weight: 3.71 gram
Axis: 1200h
Diameter: 22 mm

[Victor C]

Nice...rather than a mule, I would think it is an unlisted example. Rome is sparse for Constantius, so you would expect to see more. RIC also says after the elevation of the Caesars in 293, Rome had a bit of a pattern for workshops-- Diocletian used  ,  , and rarely  ; Maximianus used  , , and  . Constantius  and  (like your coin) and Galerius  and 

[Ken W2]

Comparing to the broad based Ts on the obverse, could that possibly be XXIT ?

Nice coin. I’ve been looking for a Constantius I XXI example for a while.

[Luuk S]

Comparing to the broad based Ts on the obverse, could that possibly be XXIT ?

Nice coin. I’ve been looking for a Constantius I XXI example for a while.

See picture below, this shows the Z in better lighting.
This is my second Constantius XXI coin, the other one is RIC 673 from Antioch.
But i like this one more because it is unlisted and i got it quite cheap 

gr Luuk

[helveticus]

Luuk,
This is indeed a nice mule with a reverse of Diocletian, a reverse which you also see, rarely,  for Maximian.
I checked in my database, your coin is, as such, unique.
Your obverse die is also a new to me.
Interestingly enough, I have several similar mules IOVI CONSERVAT AVGG with Galerius (off.  1 Ex. :Greek_2 Ex.).
Inversely, I also have 1 Ex. Diocletian with reverse PRINCIPI IVVENTVT Caesar with labarum and sceptre, minted for both Caesars

The explanation for all these mules, which are exceptions, still has to be given : moneyers' confusions, misdeeds, etc...