Help with identification a set of Liberia Souvenir Sheet JF Kennedy?

Liberia 1966 C174-small

I cannot find this in Sheet in Scott.
The stamp it self should be the 1966 C174 and in Scot it is mention one Souvenir Sheet C175 40c,
but this 35c is not mention, is this a test print or something like that?
The sheet it self is with gum.

thanks
Martin

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