Help With Some Greek Un Cleaned Coins

Thanks JWHarper (also, how does your name break down? J W Harper? J Wharper?) but it doesn't look like it I'm afraid.

The measurements are: 18mm Diameter. Thickness away from the bust is jsut over 2mm with a thinkness of nearly 4mm at the centre (due to the protusion of the busts). Ill weigh it and edit this post in a second, but I can only measure to within 2g and the patina being removed may have lightened it. It came out as 4g on the scale, so its heavier than 3g and lighter than 5g. Not much help really...

And all other coins in the batch are late 300s and early 400s AD.

EDIT: Just a thought, could it be a die mismatch?

My god I didnt expect this when I got it. Every other coin has been similar era... Ill try searching google using the image rather than the text.

I really do appreciate the help by the way - and I will be IDing this if It means building a time machine and asking a roman mint official personally.

Ill be honest, everytime I look at the coin, my mind changes on their genders. Bust A looks a lot more female, hair and scarf around shoulders. Bust B looks a lot more...regal, like they're are wearing a laurel reath. Either way, one is male, one is female.

Im going to guess at some unreadable letters on the bust A, to the left. KAHJ*squigglewhichisn'treadablebutisgenerallyrounded*H (maybe K)

That makes KAHJ*H or KAHJ*K

(edited for unforgivable spelling mistake)

Hold on! I just looked at several coins of Livia and Julia and they look very similar to this one. I reckon if I could work out the legend, it would help attribute the coin. I'm leaning towards 'not roman language'. Is there a resident expert for ancient languages?

Okay, incase one wanders by:
For Greek character, ill just put them in angle brackets.
MHN (the bust) <theta><epsilon>(not legible)

Reverse:
(maybe pi, looks like the bottom half of an X)AH(possible T)(possible H)H (the bust) <theta><epsilon>ONC*(Y or V)(not legible)

MHN θε******
XAH** θεONCY*

*This is odd, because no greek characters look like C...