The 6/16 hp Opel Torpedo Double Phaeton from 1911.
The two variants of the 10/24 hp Opel from 1911: a torpedo double phaeton and a covered limousine with a fold-down windshield.
Advertisement for the Opel aircraft engine built for the Euler biplane, from 1911.
The Opel aircraft engine, 1911.
The Opel motorized plough, 1912.
The fire of 1911. In the night of August 19, 1911, a large part of the plant was destroyed by fire.
The one-millionth, and last, Opel sewing machine, from 1911.