To my eyes, the top stamp is in the telltale shade of a 78 changeling.
Scott has a footnote about "Color changelings, especially of No. 78, are frequently offered as 70b. Obtaining a certificate from an acknowledged expert committee is strongly advised."
The giveaway is the greenish blue and "milky" cast that changelings have.
Getting, even a faulty and somewhat off center if that's all the budget allows for, certified or sold by someone who can truly identify them, 70b even just to have as a reference is a good idea.
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