I'll identify it ... gonna take a while, and might need your help

Copper, Ø:20mm

It looks like a toddler cut up this coin for his art project... it doesn't look like it weighs half the weight of the coin!

I found one similar, seems to me a little bit alien

Someone recarved a buffalo to make it an alien.

I'd like to find this symbol:

It's on the first one. (are those 2, or is there different lighting?)

just different lighting but not as good as i wanted

better picture

your coin is probably a roman provincial issue. I do not thnk that symbol you drew is a symbol though, I think it is part of the design (possibly top of a a military standart) and a letter.

what I read on your coin is Greek genetive plural:

...]OTON or OT"omega"N possibly end of a city name. (no greek alphabet on the forum?)

The guy has a horn, BTW.

check coins of Nikaia in Bithynia.

I was wrong with the inscription. Yours now read only four letters [NI-KA]-IE-WN, but I got the standarts right.

here is one for reference, but from a different emperor:



yours is very much possibly Elagabalus

You're terific  
I rode hours on the web without seing anything like that  
Thanks

Type :     Roman Provincial  
Region :     BITHYNIA
City :      Nicaea  
Issuer :     Severus Alexander  
Date Ruled :     AD 222-235  
Metal :     Bronze  
Denomination :     AE 21  
Struck / Cast :     struck  
Date Struck :     AD 222-235  
Diameter :     21 mm  
Weight :     5.85 g  
Obverse Legend :     M AYP CEYH AΛΕΞΑΝΔΡOC AV  
Obverse Description :     Laureate and draped bust right  
Reverse Legend :     NI-K-AI-E-WN  
Reverse Description :     Three standards  
Primary Reference :     cf. SNG Cop 519  
Reference2 :     BMC Pontus pg. 168, 100 var. (cuirassed)  
Reference3 :     SNG VA 523 var. (obv. legend)  
Photograph Credit :     Classical Numismatic Group  
Source :     http://www.cngcoins.com/Coin.aspx?CoinID=22448  

more likely AE19

Severus Alexander, AE19 "Three Standards" Bithynia Nicaea
Emperor: Severus Alexander. Obverse: M AYP CEV ALEXANDROC Laureate head right. Reverse: NIKAIEWN Three standards. Mint & Date of Striking: Bithynia, Nicaea Mint 222-235 AD. References: SGICV 3287. Size/Denomination/Weight: 19mm, AE Bronze, 4.75g.