Longines Ultra-Chron 7979-2

LONGINES Ultra-Chron rare diving watch reference 7979-2 in steel, Switzerland around 1970, self winding, screwed down case, unidirectional revolving bezel with 60- minutes-graduation, original winding crown, black shiny-dial, original hands, date at 3, rhodium plated movement Kal 431, 17 jewels, precision adjustment, 4 adjustments, diameter approx. 41 mm, condition 2, property of a collector