Identifying an ancient coin

Hi! I found this unique ancient coin in a lot of roman coins at a relic shop. I am wondering how old the coin is and where it came from. It looked different than the rest. I believe it is a seleucid coin.

 

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Harsh surface anyway.

 

Why do you believe it's unique?

 

I found it in a group of late Empire bronze Roman coins and it stood out

 

What is the size and weight?

 

Im not sure. The coin is pretty small though.

 

There is just enough inscription to be able to identify it. I believe it to be similar to my Demetrios.

Demetrios II, Second REIGN
Mint: Antioch
129 BC
Obvs: Laureate head of Zeus right.
Revs: BAΣΙΛEΩΣ ΔHMHTPIOY ΘEOY NIKATOPEΣ, Nike holding wreath in right hand and palm branch with left. Ξ inner left. Club outer left.
AE 18mm, 7.3g
cf. SNG Isr.288.2176, cf. SC Vol.2 2170.2
Note: This coin is on a very thick flan that weighs heavier than average. Control only noted for outer left (Unpublished).

These should be in the 16 to 20 mm range and around 5 grams.

 

Good job IDing that coin.

 

Your coin looks Greek to me. Like the coin above, it looks like one of the successors to Alexander the Great, 3rd-2nd century B.C..

 

I measured it. It’s somewhere between 15 and 20 mm but i can’t measure the weight for it. I think that’s the right coin. Thank you!