A long soak in 100% acetone might remove what appears to be dried glue/adhesive. Once removed, more details might be visible. Indeed, that's one worn coin.
Weight. It looks more like a tapered planchet issue, rather than a doubled die. If the weight is less than 3.11 and thinner on the edges of the coin, that would be why it was showing weaker devices. (Right wheat ear and the Liberty edge of the coin?)
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