I'm starting with Otto Frei's page on what they sell, http://www.ofrei.com/page252.html
Right at the top their FB-504 is purported to be the Bergeon 6111 design in disguise, for less $$. Note that Otto says theirs came first. Both Swiss, but from different Swiss makers. The Bergeon 8111 appears to be a 6111 with different knurling.
All of the above can use the same reversible tips for different sizes.
The more widely known Bergeon 6767 S(standard) and 6767 F(ine) models don't use reversible tips. You buy either model and whatever optional tips you may want. Tips aren't compatible with the FB-504/6111/8111 designs.
I am also interested in the "Japanese style" Otto shows down on the page, because of the curved or "scoop" end. More than once I've wanted to position a spring bar tip by moving the tip itself sideways and not the strap upon it indirectly if you get my meaning. (And sometimes, you can't use the strap to do that if the strap/watchhead has zero space between them, eg. G Shock squares).