Roman empire id

Hello everyone. 

I'm not sure about the attribution of this coin.

The reverse should be SALVS REIPVBLICAE, maybe from Nicomedia?

The cross in the left field leaves me puzzled. Despite the coin’s state of preservation, it doesn't look to me like the lower part of a Chi Rho.
What do you think?

Weight 1.42 grams

Diameter 12mm

 Pictures quickly cropped 

Thanks. Please let me know if you need specific details. I can make more pictures.

The cross on reverse leads to late roman.

May be change key words to get an answer : 

https://numismatics.org/ocre/results?q=fulltext%3A%22advancing+left%22+%22cross%22&lang=en

https://www.tesorillo.com/ 

Really helpful for ID'ing late roman coins

Thanks, I'll have a look