Bahco has nothing to do with SK or Facom IIRC.
My understanding was that williams/snapon/bahco used the bahco name to sell a re-label of williams to the n. america domestic market. sockets are only sae/af sizes. No metric. All metric bahco is european.
Of the european/metric stuff, there is bahco/belzer/sankvic (made in germany, red metal boxes) which is exceptionally good, and then there is cheap imports on the level with say Proxxon or Toptul from taiwan (orange blow mold cases).
The price/quality/value discrepancy of some of this stuff is massive.
Oh, and then on top of that Bahco spain also did a re-badge f-80 series ratchet, which seems to not be the ratchet in most sets.
Facom used to own SK but has never had a relationship with Bahco or Williams that I am aware. Bahco was sedish/german before Snap on bought it out; Facom was always French.
sandvik - polished/germany - accent is black, red case metal (1980-90s)
bahco eu - matte/asia - accent is orange ergonomic/blow mold case orange/blk
bahco dual 80 - chrome - accent blk/orange ergonomic grip
bahco/usa - polished williams/usa