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scott brockelmanyou will find if you lay out a few dupes of each player that is very easy to pick ou the 150 series from the front alone, the color is always much bolder and better registered as well. most all 350 series cards will have a slightly washed out or pale look. i imagine they increased production and cranked up the presses, both running low on ink at times and the printing plates probably became worn as well.
scott