Claudius II bust decoration

Dear friends,
today I bought this "common" ant. of Claudius II:



D\ IMP C CLAVDIVS AVG
R\ FELICITAS AVG

It's the new RIC online 176:



But the bust decoration is very different for me... could it be listed as variant?

Very interesting coin. It is worth mentioning as unusual; this being sometimes done in such cases.

The cuirassed bust is not usual at the Rome mint with this coat of mail appearance at that time. For Gallienus it is rare, with limited use for cuirassed bust seen from rear, perhaps to make clear the diffrence with the draped and cuirassed bust seen from rear. However later on the case can be the opposite according to period or mint cities considered, with the standard being the coat of mail appearence and the plated armour appearence the exception. Or both can also be equally used by the different emperors at the same mint city and at the same time (see in particular the coinage for ‘Carus et sui’ at Lyons, Ticinum, Rome or Siscia).

Difficult to say if this corresponds to a real change in military attire of the hight level officers and elite troops even for an ceremonial representation, or if it is only a way of engraving the obverse dies with a special purpose.

thanks Amictvs for your opinion!
This style is close to the Carus issue as you have said!
this is a good example:

Some specimens all from the Gysen collection: