Wow this is old for NZ

I went back to a park that I new had seen a bit of action during the colonial days,the military were camped here at one stage,I kept finding enough old pennys to keep me interested and I was getting a lot of falsing on some deep old iron,in amongst this iron I got a real high 12-47 and thought this is either a big lump of alloy, or just maybe a silver coin well 8" down out pops this halfcrown,turns out to be a George 1V,as none of the embossing is readable I tried a Google search and if I am not mistaken the year of manufacture was 1824.The old musket shot came from within 1 metre of the halfcrown and at around the same depth (if only they could talk what a tale they could tell)

 The pennys are all much newer ranging from 1908-1962,and of course the modern coins and jewellery were closer to the surface,also found another token the writing also is very hard to read, it needs a long term soak.