See Roger Dubuis' name on the Bulletin? That's because Dubuis himself was regulating the watch to these super-tight standards.
link And even this Bulletin is a
link statement: it's not a standard piece of paper, but a large parchment that feels more like a royal decree. At the time, Dubuis would've been one of only
link a few brands going to the lengths to obtain both the Geneva Seal and Besancon certification.