Overstrike? Die-clash? What's going on here?

I have two examples of this common denarius of Julia Domna. Something is odd about the reverse on the first, and I suspect an overstrike. Anyone know what's going on here? Anyone recognize the undertype? Post anything you feel is relevant!

Overstruck(?) reverse:


Julia Domna, AD 193-217.
Roman AR denarius, 3.37 g, 17.6 mm, 1 h.
Rome, AD 196-211.
Obv: IVLIA AVGVSTA, bare-headed and draped bust, right.
Rev: VENVS FELIX, Venus standing left, holding apple in right hand and drawing out fold of drapery with left hand.
Refs: RIC 580; BMCRE 85-89; Cohen 198; RCV --; CRE 397; Hill 379, 394.
Notes: Ex-Perron collection, 1960; ex-AK collection; CNG Triton XX, lot 614.

The usual type:


Julia Domna, AD 193-217.
Roman AR denarius, 2.37 g, 17.5 mm, 11 h.
Rome, AD 196-211.
Obv: IVLIA AVGVSTA, bare-headed and draped bust, right.
Rev: VENVS FELIX, Venus standing left, holding apple in right hand and drawing out fold of drapery with left hand.
Refs: RIC 580; BMCRE 85-89; Cohen 198; RCV --; CRE 397; Hill 379, 394.

 

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I think there's no error. The coin had been more used. Notice the space around the letter F on reverse. PMD( Metal deterioration).

 

I suspect a die clash. I don't have that one and am less than certain that it is one but it is my best guess.

Below are two coins from the same dies before and after clash.

 

Thanks, @dougsmit . Here's the reverse rotated 180 degrees if that clarifies anything. I'm not sure it does.