(a) Any person who changes, alters, removes, or obliterates the name of the manufacturer, the serial number, or any other mark of identification on any tear gas weapon is guilty of a public offense and, upon conviction, shall be punished by imprisonment pursuant to subdivision (h) of Section 1170 or by a fine of not more than two thousand dollars ($2,000), or by both that fine and imprisonment.
(b) Possession of any such weapon upon which the same shall have been changed, altered, removed, or obliterated, shall be presumptive evidence that such possessor has changed, altered, removed, or obliterated the same.