Bergeon 5700Z and Caseholding jaws (lug bits)

I simply call them lug bits, since they grap the watch case between the lugs. Note, that in the picture below, the fast mounting sledge is removed. The jaws come in different sizes and are reversible. The ones mounted in the pictures are for lug width 13 and 15 mm.
Specials jaws are required if a part of the lugs is covered by the case, as it is found often on those ellipsoid 70ies watches. You can find those special jaws in the leftmost yellow box on the overview page.