Sinn watch 140 st 140020 bracelet known as their space chronograph the sinn 140 st watch is one of the brands most illustrious models that has gone down in both watchmaking and space flight history german physicist and astronaut reinhard furrer wore one of the 140 models during the d 1 spacelab mission in 1985 demonstrating that not only could automatic watches function in a weightless environment but that sinn watches had mastered the art of reliable and accurate design powered by the si