Blancpain started the watch manufacturing since 1735. An early small Swiss Watch company that they actually using a farm house as the factory.
I had the very first Blancpain watch in 1990. I had found that the watch was very accurate.
As I always mentioned, the Accuracy of a watch reflects how seriously the watchsmith and Engineer maintin the component precision, asembly process, material studies, material selection and experinece and Skill that they commit to Make that Watch.... I am expecting a Good watch should have at least 30 PPM accuracy per day as an average for time taking in 2 weeks, My Blanpain can make it.. and Surprisingly until today I still had it running as good as perfect as it was purchased 20 years ago....