I tested it all the way from 8" opened down to 1/2" and it tightens just fine so the damaged threads are in a place that don't affect it. No breaks or cracks, just normal wear from use over the years.
The item "Rare Vintage Monster Huge 8 Jaws Morgan Milwaukee Bench Vise #80 190 lbs" is in sale since Sunday, September 5, 2021. This item is in the category "Home & Garden\Tools & Workshop Equipment\Hand Tools\Clamps & Vises". The seller is "bluesfreak2112" and is located in Lynwood, California. This item can be shipped to United States.