It is unlawful for any person engaged in the business of selling goods, wares or merchandise, securities, service or real estate to advertise the sale of the same unless it shall be stated in the advertisement of such sale clearly and unequivocally, that said person advertising such sale of goods, wares or merchandise, securities, service or real estate is a dealer in the same; provided, however, that the advertisement of the sale of any goods, wares or merchandise, securities, service or real estate, in such form as to make it plainly apparent therefrom that the person so advertising is actually engaged in the business of selling such goods, wares, or merchandise, securities, service or real estate as a business shall be deemed a sufficient compliance with the terms of this chapter.