§ 160. Unauthorized transmission of money as agent. No person, firm or corporation or unincorporated association shall represent himself to be an agent of any steamship company, express company, banking establishment or institution, or other company, for the purpose of receiving money for transmission or of transmitting the same by draft, traveller's check, money order or otherwise to foreign countries, nor shall any person, firm, corporation or unincorporated association do business as such agent, unless thereto duly authorized.