Did The Intersection Have A Legal "Photo Enforced" Warning Sign?

A site patron recently wrote an email to me highlighting an intersection in Garden Grove California that did not have the required Caltrans approved photo enforced signs, but had their city designed photo enforcement signs. At Brookhurst Street and Westminster Avenue, the city updated the sign just before September 23. He had gone through the intersection sometime in August, and had seen that they hadn't posted the legal signs yet. There is a chance that motorists who got cited while the old signs were in place can get their tickets reversed, if they show that the old sign was in place at the time they went through. What do the legal signs look like? I will be posting legal Caltrans signs very shortly.