A person commits a class 1 misdemeanor if he knowingly and unlawfully possesses a firearm, the manufacturer's serial number of which, or other distinguishing number or identification mark, has been removed, defaced, altered, or destroyed, except by normal wear and tear.
Source: L. 71: R&RE, p. 482, � 1. C.R.S. 1963: � 40-12-103. L. 81: Entire section amended, p. 976, � 18, effective July 1.