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What is this hammer used for?

A query from Roy Forward, about a photograph he received from a friend in France, which he took at a village open day.

P1030616 1024x575The hammer was of similar shape & labelled, in french, as a road menders hammer ( presumably pre macadam).
The head in the photographs weighs 6lbs 12oz. (Roy has another one which weighs 16lbs).

P1030615 1024x575

 The rectangular striking face is slightly concave across the shortest edge for the whole length.

 What was the hammer used for?

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