Thanks Pete. They are in fact 1990 tokens. In fact one of the sets are yellow in color and the other is white. Here is the link to the one on -
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=6256269494&category=3512

But then I have a set that is not dated (photo attached). They are in a screwed closed acrylic case and have been since they were given to my Aunt by Elta Gray. Reverse photo is here -
http://www.chipguide.com/tcbuploads.php?image=1990_Excalibur_2.jpg

And a link to one of the white ones on Dan's Casino Token website -
http://www.casino-tokens.com/images/ExcaliburArthur234mm.jpg

Also on Dan's website, he says he has two different varieties of these NCM 1990 tokens with two different size mintmarks (one is 2 3/4 mm and the other 2 mm) to make things even more confusing!

I am just trying to get some information and figure out why there are all the differences on these tokens.

In addition, I have a price list that was put out by Elta Gray dated 1992, and the set I have was valued at $100 at that time. Yikes! Talk about confusion!