Roman Coin I'd Help

I can't help you with IDing the coin, but it's a very cool piece. I especially like the bird on the reverse. Congrats on your first Roman coin!

Yes, it's a nice one. To my eye it at least looks authentic.

I don't know anything about these either, but! The glare reflecting off the plastic makes it harder to see the coin. If you busted it out of the holder and took photos, we would be able to see the details more clearly (which helps with identification and valuation).

Awesome! Thanks so much for the education. It's so cool.

This coin 'type' was issued by both Constantine I and his eastern co-emperor Licinius I and is the standard issue for this period throughout the whole empire. After the chaos of the early 4th century when the empire endured 4,5 and 6 emperors at a time these two "Generalissimo's" had reached a 'temporary' accommodation with the eastern emperor Licinius marrying the sister of Constantine. The truce was temporary. In the end Licinius and his son (the nephew of Constantine) Licinius II both were 'deposed'(AD324) and later executed and Constantine became sole emperor. The coin dates from a period of peace and harmony between the two as indicated by the designation AVGG, meaning that there are two officially recognized emperors.
The coin has endured 1700 years buried in the ground and will suffer no insult by you taking it out and holding it in hand. The great advantage collectors of ancient coins have over modern coins is we enjoy holding them !
As for the reverse legend IOVI CONSERVATORI ......
Translations are of necessity half 'interpretation'. The latin noun "conservator" can be rendered as 'savior'. Given the fierce competition that was taking place at this time between the 'old' and the 'new' religions I am inclined to read it simply as "Zeus Saves !"

The coin does not appear to be 'corroded' but has some grunge adhering to it. Some people like a little dirt .... some prefer them clean. Once cleaned though they are cleaned for good. You might soak in olive oil for a few weeks and then brush lightly with an old toothbrush.
Over cleaning is very bad though so whatever you do don't be hasty about it. If you begin to see bronze coming through stop immediately !