I was detecting a WWII air-ground range yesterday, where anything unrelated is a very rare find (even trash is rare

). Targets are normally .303 cases, with a few .303 bullets, 20mm cases and in extremely rare instances 20mm bullets (I think they are normally too deep), so I can normally tell what a target is before digging it.
But one signal suggesting a .303 case did not sound quite right, imagine my suprise when this beauty popped up. I have not had a halfcrown for a very long time so to get one in this good a condition from this site was a real bonus
Evan