Section 60K. No person shall, directly or indirectly, engage in the practice of architecture in this commonwealth, except as hereinafter set forth in section sixty L, or use the title ''architect'', ''registered architect'', ''architectural designer'', or display or use any words, letters, figures, title, sign, card, advertisement or other device to indicate that such person offers to engage or engages in the practice of architecture unless he is registered under the provisions of sections sixty A to sixty O, inclusive.