These are called Gas Bubbles. They don't add value to the coin. It's a plating issue, which was common back in 1982 and so on. They can be also called Plating Blisters as well. http://www.error-ref.com/gas-bubbles/
Looks like a poor plating job. The die state was very nice. The strike/planchet was the issue. Note the motto, how clear the devices are and the fields.
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