The Longines Master Collection Moonphase L2.919.4.78.6 is a luxurious 42 mm stainless‑steel automatic timepiece featuring a silver “barley‑corn” dial with blued Arabic numerals, hours, minutes, seconds, date by small hand and moon‑phase display at 6 o’clock. Powered by calibre L899 with approx. 72‑hour power reserve at 25,200 vph, it is fitted with sapphire crystal, transparent back, 3 bar water resistance and a stainless‑steel bracelet with triple‑safety folding clasp.