... when it comes to Blancpain today.
Since your indication, Blancpain would utilize outside assembly, was contrary to what I learned during my recent visit, I took the liberty to raise this point with Blancpain for factual clarification.
I can positively confirm that Blancpain does assemble all their timepieces themselves. Whether that was different during the Biver era (a time you have a lot more knowledge about than I do) I cannot tell.
The real reason the entire assembly section is not open to vistors is that Blancpain wants to apply the understandable confidence towards some non Swatch Group brands they also produce movements and more for.
Cheers
Henrik