For your consideration is this precision toolmakers vise.
This has a jaw width of about 57mm and a travel of about 54mm.
This adjusts with 14mm bolt heads. There is one adjustment for jaw opening and one that tightens the movable jaw into a secure position.
The condition appears well used with some oxidation and one side has been abraded by a grinder. The performance of the tool appears to be unhindered.
Please see the photos for more detail.