Dummy or Deactivated ? Help!

My shell, identified on this site as one used in the Tornado or navy - Steel case, also has headstamp showing LOT R6 - 1 - 101-X which has not been identified - See my previous post for image – HELP!
Does not look fired, so it is possibly a dummy, practise round, or deactivate. Any info out there?
Cheers muttongeoff[
date=2019-06-26 timezone=“Europe/London”]

DSC01482