Help Identify

This is a machinist setup block or setup cross. It can be used as a precision gauge or as a precision setup for things like a round shaft on a horizontal or vertical mill. I dont know of anyone still manufacturing these because of v-blocks and 1,2 3 blocks. We made 2 of these each when I went through apprentice school. Very handy little blocks and precision ground.

References:

https://www.jbtools.com/hhip-120-x-120-x-35mm-four-way-v-block-set-3406-1045/

Reason:
thank you for the opinion, as its looks similar to that, its still looks different from this one,