In a throwback to your parent's Clue game, or perhaps your grandparent's I picked up this pair of 12" monkey wrenches. Both are very vintage, especially the Pexto which is an antique. The nickel one is a Diamond Horseshoe, from the company in Minnesota, and as best I can determine is from some time in the 1950's. The Pexto is an antique, and at over 3-1/2 pounds with jaws an inch wide, it's also a very lethal weapon. It was made circa WWI, with my best guess at circa 1914 or so. Unlike many Pexto, it has a steel handle that's pegged to the rectangular shaft with a large steel pin. Jaws on the Diamond are also wide at 3/4" compared to most car/truck/Ford monkey wrenches and its I-beam handle forging makes it strong while reducing weight (and material used). Both have built-in thumb detectors, also unlike most monkey wrenches, another reason for the wider jaws. Both work extremely will with the rack and worm gearing in excellent condition and the jaws meet up flush with no appreciable gap. They're in excellent condition compared to most which have been misused and abused, with mangled jaws and bent handles from being over-torqued using cheater pipes (or standing on the handle), as if they were millwright wrenches, and the ones without hammer heads having been bashed up being used as hammers.
While the Pexto is mostly conversation piece, the Diamond isn't and wanted a 12". I use monkey wrenches for plumbing work (have two more of the Ford style a bit smaller) as their jaws open enough to deal with the hex nuts on residential and light industrial drain pipe fittings, metal and PVC. It's not that high a torque application exceeding what they were designed for.
John