Yes, this is a real Mew 
.
On a real copy:
- The star () should have the iridescent foil
- Mew’s body should have the iridescent foil
- The borders of the “You can’t have more than 1 Pokemon in your deck” text box should have the iridescent foil around it
- The borders of the textbox should have the iridescent foil around it
- You should see a foil layer between the delta species insignia and the hit points (see second image), and around the border of the art box
Getting the iridescent foil around the non-art box (non-Mew) portions of the card is extremely difficult for forgeries.
This is what fakes and proxies look like:
Regarding price, your copy is pretty badly damaged. I would expect $250-$400 USD.