The names and addresses have been digitally smudged to protect the innocent.
There are a couple of oddities I would like to point out.
The nice CDS cancel on the stamp says USPO (United States Post Office) at the bottom. The United States Post Office had been disbanded eight years previously to become the USPS (United States Postal Service). The meter imprint was used to pay for the certification. You can tell this meter was issued in a post office because in the town mark (circular town mark with date) it has the letters "P" and "O" on the each side. Newer meters in the USPS era (since 1971) have "US" and "PS" on each side.

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