C. Three-body, polished and brushed, transparent case back with six screws, graduated unidirectional revolving black bezel for the decompression times, protected and screwed-down winding-crown, sapphire crystals. D. Textured black with applied large luminous indexes, large subsidiary seconds dial, in the center the date "1846" in red numerals, graduation for the up-and-down indication at 12, cyclops aperture for the date at 6. Luminous skeletonized steel epée hands. M. Cal. UN 26, rhodium-plated, 28 jewels, straight-line lever escapement, monometallic balance, shock absorber, selfcompensating flat balance spring, micrometer regulator. Dial, case and movement signed. Diam. 43 mm. Thickness 14 mm.