Not sure if my Emerald Sea is a oil or a print. It is signed A Dzigurski.
Other info says 200 examined, T1401/ V4518-619 P309.
This does not mean anything to me, so any information will be appreciated.
Thank you.

Please take it to a reputable art dealer. Here's more about the artist, including a video of him painting:

Alexander Dzigurski (http://www.bodegabayheritagegallery.com/Dzigurski_Alexander_.htm)

Simply feeling the painting will tell you whether it's an original or a print. Is it on a canvas or paper? Does it feel smooth or have bumps? Is it in a frame without glass, or with?

You have a signed copy, therefore the number system. It is a print but the signature authentic. The artist signed only so many copies.