Looks like machine damage on the devices. If they are flat shelf like, then it is probably that. If it looks like any these, then that is probably what it is:

The step down is caused by die movement damaging the devices during the strike.
The big doubled die looks like this:

{Only two known)

The step down is caused by die movement damaging the devices during the strike.
The big doubled die looks like this:

{Only two known)




















