The monogram on the receiver ring, W under a Prussian King’s crown, is not that of Wilhelm II, Kaiser from 1888 – 1918, but of his grandfather Wilhelm I, King of Prussia 1861 – 1888, additionally but reluctantly German Kaiser 1871 – 1888. His time span fits much better with Ferdinand Fruwirth’s 1871 repeater design than a post-1888 date.