No person shall deliver or otherwise transfer a pistol, revolver or gun as defined in this act, to a person unless it be securely wrapped and unloaded. Before the same is delivered to the purchaser, he shall sign in triplicate and deliver to the seller a statement containing his full name, address, occupation, nationality, the date of sale, the caliber, make, model and manufacturer’s number of the weapon. The seller shall, within thirty days thereafter, sign and mail by registered letter one copy thereof to the secretary of state, one copy to the chief of police of the city or village in which the same was sold or to the sheriff of the county of which the seller is a resident and shall retain the other copy. This section shall not apply to sales at wholesale. Any person convicted of wilfully violating the provisions of this section shall be punished by a fine of not less than one hundred dollars or by imprisonment of not more than one year or by both such fine and imprisonment in the discretion of the magistrate.