Thus, you will face the charge of forgery in the third degree if you falsely complete, make or alter a written instrument with the intent to defraud. Forgery, deceive or injure another, he falsely makes, completes or alters a written instrument which is or purports to be.The (specify) count is Criminal Possession of a Forged. Instrument in the Third Degree. New York Forgery in the Third Degree is a Class "A" misdemeanor. Criminal possession of a forged instrument in the third degree is a class A misdemeanor forgery crime and can result in up to one year in jail.