Does it feel heavier than if it was a normal block of steel for its size?
Interesting!
Why it should weight more than normal steel? Tool steels does not weight more than any other steel.
I've seen few fake dies that was not made in normal die/tool steel. They were made from mild construction steel and was not hardened. Die should be approx 59-60HRC. Than can be tested with Rockwell or simply any file. It is hardness when file does not work any more.
