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TBobOne way of determining if the Jackson is a reprint or reproduction is to do exactly what Koos did, measure the length, width and area of the "picture area." We all know that the E90-1s are notorious for different lengths and widths when you count the borders but they should match identically when you measure the area of the picture. I am aware of two different E90-1 reprint sets floating around, one is easily discernible because of color and gloss. The other is from the infamous "20" set, so called because all the reprint cards in that set were produced with the tiny "20" on the back upper left. Often you will see reprints with a tiny amount of paper damage or "scuff" in that area where it has been removed. The Speaker I bought in an auction on line (and returned) is more ingenious but has the same problem the glossy reprints do, smaller picture area. So we now know there are 3 E90-1 reprint groups floating around out there. This doesn't preclude the possibility of a scanned or otherwie reproduced homemade card.
Remember when the hobby was just a hobby? Sigh....