The web says the panel did have a spot for a turn signal on both sides but only one side was used on early years 60-62? The same light flashes for left and right turns. Some people report lights on both sides in 61. Either factory added or panel was changed to newer when repaired. First thing to check is the flasher.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn