What is this old dark grey LEGO wedge piece with a grooved handle? Here is an odd piece that I have found - any idea what it is? 2x2 plate is shown for scale.
It's a LEGO brick Separator tool. Mostly used to preserve the structural integrity of the human nail, teeth, gum line etc...

Watch the classical use of it here.



Here's a recent post of some unorthodox uses of the Separator tool.