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Rhett YeakleyI just threw together a scan of 3 different Walter Holke (portraits), All 3 have blank backs, and they are in order from left-right W575-1 (Type I- E121 quality), W501, and W575-1 (Type II- W501 quality (personally prefer the W501-Type II due to shared 120 card checklist).
-Rhett
More can be seen on my website, under the "Caramel" section, however photo size will be less and grainy-ness of photo sometimes hard to appreciate.
http://www.starsofthediamond.com/caramel.html