I'll venture $8 to $10. Without the Scott C3, market price of the cover is about $5, and the C3 here doesn't add much. It's not a particularly well centered example, and Artcraft covers are produced en masse so they don't command much of a price for any issue. And if the C3 was mint when affixed to the cover, this usage likely decreased the value of the C3. Too bad.
For my modest collection of material it is still special. I've not seen another one like it. I have another question for you? I have two new jenny sheets of six unopened. Is there value slightly more? We both know the chances of right side up stamps don't we?
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