The pills you have are definitely generic
OxyContin 80 mg.
They were approved by the FDA on March 24, 2004 and are manufactured by Teva Pharmaceuticals.
Product:
Oxycodone HCl Extended-Release Tablets 80 mg CII
Strength: 80 mg
Brand Name: OxyContin® Tablets
Imprint Code: 93/33
Description: Oval, Green
You will find this description and an image at tevapharmusa.com
Info at
http://oxycodone.drugs.com