I think some may be comparing apples to oranges.
Since ~2002, both Uberti and Pietta have been producing revolvers using CNC machining. There is a video about the Pietta factory operations these days vs. the pre-CNC days, wherein A. Pietta explains that Pietta used to use subcontractors form Northern Italy, and those parts needed fitting at the Pietta factory before Pietta could offer the guns for sale. I will post it if wanted.
The Belgian Centaure revolvers were made in the early 60's without the then-unheard-of idea of computer controlled CNC machining. I think they were most likely on a par with Gregorelli & Uberti, Uberti, Armi San Marco, Armi San Paolo, C.O.M. (a N. Italian consortium in Brescia), A. Mainardi, DGG, et al.
These are a couple of Centennial Arms (importers of Centaure in Chicago) advertisements from a 1962
Guns Magazine issue.
These may bring back some memories for old farts like me.
Regards,
Jim