Oyster Chronograph Antimagnate Monoblocco Ref 3484 Cal. 13''' nickel-finished lever movement, 17 jewels, the gilt matte dial with gold hard enamel baton and Arabic numerals on 12 and 6 , outer black railway five minute divisions, tachymeter and telemeter scales, two engine-turned subsidiary dials indicating constant seconds and 30 minutes register, in circular case with downturned straight lugs, snap on back, two rectangular chronograph buttons in the band,
