cal. 873 manual winding nickel lever movement 25 jewels mono-metallic balance • silvered dial with guilloché centre Arabic numerals blued steel baton hands fan-form aperture for day and night indication 8 day power reserve indication aperture for moon-phases combined with subsidiary dial for constant seconds • stainless steel polished reversible case sapphire crystal display back • case dial and movement signed • with a stainless steel Jaeger-LeCoultre double folding clasp