Longines XL-18

European Watch Clock and Jewellery Fair 1982 - BF 1016Q
A Longines model whose good looks are permanently protected by its case in XL-18 - three times harder than steel and five times harder than 18K gold - and sapphire crystal. The two-tone look is obtained by bombarding the case with titanium : the result is a yellow hue. Extra-thin proprietary quartz movement. (LONCINES XL-l8)