Helmet over-stamp across 3 bears on Swiss pocket watch

Hi I recently purchased a Swiss enamel faced pocket watch in need of restoration. While the inside of the rear of the case simply has three bears, the inside of the inner dust cover has the three bears over-stamped by a knight’s helmet with a plume as shown in the attached photograph. I assume this may be an import mark.

Assistance in interpreting the hallmark would be much appreciated.

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