There is in fact two identical guns at that location.
Right gun markings : 'n°4402 - 1906'; Arms of REUSS Principality on the tube.
Left gun markings : 'n°4935 Rh MF - 1908'.
This gun tube received nice arms : a frieze near the muzzle, an eagle with the sentence Pro Gloria et Patria, the arms of Reuss Principality with the sentence Utima Ratio Regis.
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