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davidi think this issue is closer to the R308 then the Ray-o-prints in that you just needed to wet the card and expose to light. additionally, i am not convinced these were actually issued and might be a test run. the contrast on the cards in exceptional for a self developing photo issue. i am a pretty avid collector of these types of cards and i have never seen a card with such contrast and clarity of the image, never mind an entire set of cards. i have never held one of these in my hands so it is really hard to tell but what is the evidence that these are self developing cards?