Each and every mechanical amusement device displayed by any licensee must bear the seal of approval of the City Manager. Such seal of approval shall be affixed to such device by the City Manager or by the person or persons designated by him, after an inspection and examination of such mechanical amusement device, and only when such examination and inspection reveal that such device complies with the requirements of this chapter and is not a gambling device and will not be used for gambling. No person shall display any mechanical amusement device, except coin-operated phonographs, which has been altered or changed in any material way after the seal of approval hereinafter required has been affixed thereto.
No person who has been designated by the City Manager shall display any mechanical amusement device to which any person other than those designated by the City Manager has affixed the seal of approval or any imitation or facsimile thereof.