Cal. 861 manual winding copper-finished lever movement, 17 jewels, mono-metallic compensation balance • gray dial, luminescent baton indexes, fluorescent orange baton hands, three subsidiary dials indicating red and black 30-minute and 12-hour registers and constant seconds, outer white ring for chronograph scale, bordered by blue, black and white rotating ring indicating 24 hours • large cushion water-resistant-type case with two round chronograph pushers in the band, crown for 24-hour ring adjustment at 10 o'clock, screw back • case, dial and movement signed.

Ref Variations: ST145019,