Harbinger Sign Celebrating Sixty Years! any . Serving Orange County Ca. any . Serving Orange County Ca. any . Serving Orange County Ca. – Irvine Sign Company . Serving Orange County Ca. – Irvine Sign Company mpany. Serving Orange County Ca. – Irvine Sign Company – OC Sign Company. Serving Orange County Ca. – Irvine Sign Company – OC Sign Company. Serving Orange County Ca. – Irvine Sign Company – OC Sign Company. Serving Orange County Ca. – Irvine Sign Company – OC Sign Company. Serving Orange County Ca. – Irvine Sign Company – OC Sign Company. Serving Orange County Ca. – Irvine Sign Company – OC Sign Company. Serving Orange County Ca. – Irvine Sign Company – OC Sign Company. Serv