Never seen one and need a starting point

I am almost finished with this but have no idea what it is or where to start on the identification. Any help would be appreciated.

 

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It's Byzantine

 

Thanks

 

Rotate your first pic 90 degrees to the right to reveal letter "K"

This is a half-follis of 20 nummi. No obverse to speak of so that's all you're goiing to get

 

@red_spork @hotwheelsearl Any idea of what era it is from? Appreciate the help.

 

It's possible it may be from the Justinian era, 6th-7th century?

 

I can't tell which side is "up" on the obverse, but the reverse is definitely a half follis. ANNO to the right of the "K". Looks like maybe "TES" underneath for the mintmark and a θ and cross above the K.

 

I think I also see TES, which would make it from Thessalonica.