Cartier Obus Paris dial in 18 k yellow gold Blue enamel numeralsIntroduced in the 1920soften cited as 1923 or 1929the Cartier Tank Obus is a rare and distinctive member of the Tank family, immediately recognizable by its square case and signature obus (bullet or shell shaped) lugs. The example at hand features a beautiful 18 kt yellow gold case measuring 25 25 mm, with a wide polished bezel and bold vivid blue enamel Roman numerals. The clean white dial is signed Paris and paired with the characteristic blued