BAUME & MERCIER Tronosonic rare gents wristwatch with tuning-fork movement, Switzerland around 1972, stainless steel case with screwed-down case back, original bracelet with deployant clasp, white dial with Roman numerals, black hands, date & day (French), calibre BM 19162/ESA 9164, 12 jewels, measures approx. 40 x 36 mm, length approx. 18,5 cm, signs of use revised, otherwise condition 2