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I think this is the famous Maxim 08/15 machine gun from WW1.

The word 08/15 lives on as an idiom in colloquial German, 08/15 (pronounced Null-acht-fünfzehn), being used even today as an adjective to denote something totally ordinary and lacking in originality or specialness. However, this is one of several possible origins of the idiom.

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Machine gun (I presume a Maxim wz. 1910/28, since it was the model used by Second Polish Republic’s Army).

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War Memorial of Ellezelles

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Le Muy.

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Monument van de Gesneuvelden en Oorlogsslachtoffers van Nieuwpoort.

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King Albert Monument