Pair of Antique Oak Sash Clamp Woodwork Tools

Pair of antique wooden sash clamps or cramps, made in oak in the early 1900's probably. Used to hold planks of wood together while the glue dries. Still quite useable I expect but more of a display item really; today's equivalents are metal. The screw threads on these are super, still quite defined; probably made in a harder wood than oak even, maybe hornbeam? There's a maker or owner's name stamped on the side.