Trial coin, 5 Mark 1970, Friedrich Hölderlin

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5 Mark, 1970, commemorative coin about Friedrich Hölderlin. Unfortunately, this version was not adapted by the government. Therefore we can only get the trial coins.
The content above is from Helmut Caspar‘s article “ Das Saarland aus Silber”, but I don’t understand, how did Mr. Helmut Caspar know the information about the unadapted design? What’s the meaning of the code “7008”? Anyone know the answer? My friends.

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