Just a thought. Given the way printing was done then, It's unlikely the cards from a koesters sheet are exactly identical to W575s having come from a different printing plate. The key being "exactly". It's probable that there are tiny differences in the screening or dot pattern between the two sets. Inconsequential differences for most purposes, but still different enough to tell. If I owned any I'd do some 800 dpi scans and then I'd know for sure.
Steve
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