Andy Burns wrote:
Dan S. MacAbre wrote:

a kind of Mole grip, but the pivot/fulcrum/whatever could be moved
into four positions

http://www.expert-toolstore.com/facom-lock-grip-pliers/1348-facom-500-short-nose-4-position-lock-grip-pliers


Yes, that's it. Although ISTR that the bottom jaw was a bit more
substantial. But I could easily have imagined that.