For those quibbling about vises, the post vice did have the advantage of isolating the shock from the screw such that over time the screw wasnt damaged, this has been mentioned but its not just used for hot forging, or even heavy forging. Cold punching, drifting pins etc. Post vises mounted at filing height for bench work ( as in the photo) are faster to use and faster to adjust than an machinist vise because the jaw is spring loaded and there is no backlash in the screw.
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