Septimius Severus and Caracalla, AE27 of Nikopolis ad Istrum. 
Magistrate Ovinus Tertullus. 12.07 gm.

Obv: [AV K L CEP CEVHPOC] P [AV K M AVPH ANTWNINOC, laureate
busts of Septimius Severus and Caracalla facing each other.
Rev: VPA OOVI TEPTVLLOV NIKOPO PROC, around EVT-VXWC-TOIC 
KVPIOK, legend in four lines within wreath.

Varbanov 2828var (legend breaks on reverse).

Courtesy of "JC", http://rocketjc.blogspot.com.

JC kindly provides the following information:

The inscription in the wreath, EVTVXWC TOIC KVPIOIC, reads 
"Good luck to the emperors!", a reference to the elevation 
of Caracalla and Geta to Augustus and Caesar in 198 A.D. 
A similar issue with an obverse of Caracalla and Geta, 
cf AMNG 1625, but with a different reverse die is known to 
exist.