For your consideration is this Taft Peirce No.990G precision V-block with a clamp.
The clamp may be swung to the side or completely removed. There is a marking of .0135 scribed in marker on either side of the unit.
The front is lightly marked with the company logo, model number, and patent information.
This appears to be in good operable condition. The screws turn easily with nicely knurled tops. There are signs of minor wear to the surfaces.
Please see the photos for more detail.