Gilt brass "compteur ˆ pointage nouveau modle" inking Chronograph with 60 minute recorder, white enamel dial, Breguet inking hand, gilt brass movement with going barrel and cylinder escapement. Diam. 79mm. Sold on November 4, 1845 to the "Collge Royal de Lyon" for the sum of 280 F.
aperture=f4.0 focal length: 17.7 mm exposure 1/125 sec ISO: 100