Some rare Wittnauer literature on the Electro-Chrons.  The first one introduces the New Wittnauer Electric Watch, so gives us a good clue on what the early Electro-Chrons looked like. It also shows the period bracelet and both the white and blacked dialled versions.

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The second leaflet is clearly later and now introduces us to the New Wittnauer Electro-Chron.  It also shows a gold capped version in the price list.