I believe you mean his purported long form Birth Certificate. (In previous discussions here, "COLB" has generally stood for the short form "Certification of Live Birth," several fraudulent images of which have also been produced on various web sites.) Although an amateur might be able to detect the forgery, the Arpaio Cold Case Posse had a well respected Certified Forensic Document Examiner analyze the image of the purported BC placed on the the White House web site and he came to the same conclusion. Make Zullo, the lead investigator for the Cold Case Posse, has explained in detail his findings of forgery in several videos.
No, there was a short-form COLB put on the internet earlier, and a long-form COLB put on the internet by Obama. Neither one, strictly speaking, is a birth certificate.