The best way to tell is usually by checking for the station ID during the cartoon segment (see the link to my site that auximenies gave above for details). If there is no station ID, it may be the New York WCBS version, which only showed the ID during commercial breaks.

The picture there looks fairly sharp compared to most, but the color is absolutely horrible (the reds in particular). I don't think I've seen one that looked quite like that. If you find you can't identify it by my list, let me know and I'll help you out.

--SKot