Out of my field of identification

Can you guys please help me with ID of this one. I got it as an x-mas gift from my daughter. Tried to ID it a couple times with no results. And some info on conservation and storage would be greatly appreciated.

 

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Constantine I
A.D. 328
Obv. CONSTANTINVS MAX AVG rosette diademed, dr., cuir. bust
Rev. CONSTANTINIANA DAFNE [Constantinian Dafne] Victory seated l. on cippus, palm branch in left hand and laurel branch in right hand, looking r.; trophy at front, at the foot is a kneeling captive with head turned being spurned by Victory; epsilon in left field
in ex.CONS
RIC VII Constantinople 35

http://www.constantinethegreatcoins.com/dafgal/

 

It's Constantine I, CONSTANTINIANA DAFNE type, but I don't like the surfaces. It doesn't look authentic. It has the mushy, bubbly look of a cast.

 

I think it is just harshly cleaned.

 

I have to agree with @Nicholas Molinari. I think it is authentic.

 

These often strike me as being a bit different in style than other Constantine types. Was it engraved by a different team (the Aureus crew?) or am I just hallucinating? In addition to this bust with extra shoulder, the reverse comes with the 'eyes to heaven' obverse.
https://www.cngcoins.com/Coin.aspx?CoinID=22946

 

there are actually three bust types-

1.head with diadem
2. head with diadem looking upwards
3. diademed, draped and cuirassed bust

for more info--

http://www.constantinethegreatcoins.com//DAFNE/

for examples of each--

http://www.constantinethegreatcoins.com/dafgal/

below is the head with diadem, which was the first bust type for this issue

 

Hey alurid, congrats on the new coin (man, I love the cool green crusties => those are always my favourites!!)

Ummm, but it is very, very round (hopefully that's not a bad sign?) ... I doubt it ... it's probably fine (congrats on your new addition)

 

Since the OP has been attributed, I'll just add I also regard it as authentic but harshly cleaned and worn by circulation..... and perhaps a bit weakly struck with worn dies?

 

Thanks ever so much, To all. Truly amazing amount of information.
Any advice on my green crusties? Are they not damaging this coin?

 

If the pretty green stuff is merely hard crustations then you're okay ... if any of them become powdery and easily removed by a wooden toothpick, then you should post the coin again and the folks will tell you how to protect it from bronze disease (verdigris, whatev)

... I always love a tiny bit of grunge on my ancient coins (it keeps them looking honest)

 

What is the market value of the OP's coin? Thank you.

 

It is the most common of the DAFNE bust types and also the most common mintmark of CONS, the rarer ones, which have the same bust, being CONS✶ and CONS•. I would probably list it for around thirty dollars, maybe a bit more (no more than 40) or less depending on what it looked like in hand and how it photographed.