Interesting reading. Resolution 10 only declares the decimal separator, leaving that to language convention still whether to use comma or dot (as opposed to finally unifying that, wouldn't that have been something?). As for thousands separators, it just reaffirms Resolution 7 of the 9th CGPM from 1948 which made the declaration of spaces, never dots nor commas.

So it's actually been since 1948 that the GCWM/SI system has been recommending spaces as grouping separator? Wow.