Day-Date Serpico Y Laino 6611

Replaced the 6511 in 1957 with an improved 1055 that could pass chronometerChronometerA watch or movement certified for timekeeping precision under a defined testing standard. The applicable certification depends on its maker and period; it is not the same as a chronograph. testing. The first Day-Date with “Superlative ChronometerChronometerA watch or movement certified for timekeeping precision under a defined testing standard. The applicable certification depends on its maker and period; it is not the same as a chronograph. Officially Certified” at 6; pie-pan dial and reeded bezelThe frame surrounding the crystal at the front of a watch., typically with Alpha or leaf hands. Ran until the 1800 series took over in 1959.