How accurate is a vintage wristwatch?

WATCH TYPE SECONDS GAIN/LOSS PER DAY             WORST    TYPICAL   BEST

Vintage mechanical Swiss watch in good repair           +/-60        +/-15          +/-5

Modern mechanical watch non-certified                       +/-10        +/-5            +/-2

Modern mechanical watch chronometer certified       +6/-4        +/-3           +/-1

Modern quartz watch non-certified (normal)               +/-2          +/-1           +/-0.1

Modern quartz watch chronometer certified (rare)    +/-0.02     +/-0.02    +/-0.0