Conn. Gen. Stat. § 53a-138: Forgery in the first degree: Class C felony.

(a) A person is guilty of forgery in the first degree when, with intent to defraud, deceive or injure another, he falsely makes, completes or alters a written instrument or issues or possesses any written instrument which he knows to be forged, which is or purports to be, or which is calculated to become or represent if completed: (1) Part of an issue of money, stamps, securities or other valuable instruments issued by a government or governmental instrumentality; or (2) part of an issue of stock, bonds or other instruments representing interests in or claims against a corporate or other organization or its property.

(b) Forgery in the first degree is a class C felony.