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I think this (-2/+6) is for the older in house movement, the new, smaller one for BB58 is supposed to be -2/+4. I’ve read it somewhere where they compared it to Rolex which is -2/+2 saying that every guaranteed second means a lot more investment.
PawG-
COSC is, basically, -4/+6 as Stonehenge said. There are no other widely accepted independent certifications of a chronometer as far as I’m aware. Omega’s METAS “master chronometer” certification is their own definition (adding magnetic resistance), as is Rolex’s “superlative chronometer” standard of -2/+2.
Regal
Not sure where the -2/+4 is from but these are the figures for COSC chrono certification
The final test figure is taken as an average of 5 different positions (with a max variance of 5 or 7 seconds between positions) at three different temperatures IIRC.