I am wondering if you ever found out any additional information about your vise. I was recently given the exact vise but mine is in tougher shape. It only came with one jaw, the dynamic is cracked on the far side down the center about 3" and the area that holds the jaw is chipped. I like a challenge so I will be bringing it back to life for light duty use. The body and handle on these sure seem heavy duty for no bigger than the jaws are. I wonder if they didn't use the same parts on larger models.
