Posted By:
PaulI wanted to let the group know that I was contacted by the seller of the Ruth card. He very politely explained the reasons why he believes Koesters can be distinguished from W575-1s. The primary reason is the card stock, which he says is much thinner and grayer on a W575-1 than on a Koester. The Koesters, he said, are much more like an E121, except for the blank back of course.
The seller actually sounded quite knowledgeable, so if you have any questions, you may want to contact him. Bottom line on this one: please rely on your own opinion, not mine.