This is a tool used for crimping thr EDAC 516 series of connectors that are widely used on top end mixers and other audio equipment, over the years I have found a lot of these connectors etc so will list them as they appear.
This is the original tool -200 now they show a new tool -201 but i do not know what the diffference is.
All these tools have replaceable jaws to allow other crimp tool blocks to be inserted. never used, still in original box