I think there are a few things you need to cafirly for your readers:- (Manual wind)Mechanical watch: accuracy is VERY high . Compare to what? A sundial? The average mechanical watch (unless it is a chronometer or have underwent meticulous adjustment), whether it is automatic or manual wind typically varies from 10 to 30 seconds a day from the accurate time, which is certainly not that accurate.- Quartz watch: there were NO Olympic games back in 1869; check your facts before posting.- Automatic mechanical watch: .. and store energy by IC control .. , what is IC control??? Do you mean integrated circuit? That's not what a mechanical watch is about; a mechanical watch stores energy in its main spring, not in an electronic circuit.