I have at least 5 of these similar type wrenches that I call railroad wrenches, up to 18" in length. They are railroad wrenches because it gives them a descriptive and alliterative name and because several of the ones I've found have been stamped with the abbreviation for various railroads like Erie and Lehigh Valley. I have a pipe wrench stamped with NY,NH&H - New York, New Haven and Hartford Railroad.
They are very useful for breaking loose large nuts on various cylindrical assemblies, but I mostly use them for bending and straightening metal brackets and panels. The handles will accept a pipe for increased leverage.
Al