Hello, I am a pretty serious metal detectorist that loves picking up old bottles and marbles also. My dilemma is that I heard that the Cats eye style marbles were flooded by Japanese manufacturers in the late 50's, early 60's. Is this correct ? I have been tossing cat eyes when I come across them as I only want the older American marbles. Another main question that I have is how can I distinguish a Japanese cat eye from a U.S. ? Cat eyes are on the lower end of my marble desirability scale, but if they are the real older U.S. deal, I could still appreciate them.