General Discussion

Any wrench that use a circle of semicircle that reverses is an Eicher wrench.
An oil filter wrench, a jar lid removal wrench, a basin wrench; all forms of Eicher Wrench.
But, that contraption she has also has what appears to be a ratchet head above the jaws which would render those useless.
Also, for most applications, why would it be made of brass? Brass is usually used on wrenches to assure spark-free uses. I've seen them used on railcar domes where the contents are highly flammable as on, for instance, and ethylene oxide railcar.
Don't think a plumber needs brass which wears out sooner.