Thanks guys, Numpty, I found an 1806 George III HP a while back that also had a square nail hole through it, I presume they both met the same fate as Irish good luck charms.
This morning I headed out for another relic hunt, turned out to be a bust, someone else had been there previously and cleaned up. I ended up scouting further out from one of our previously detected spots, just to see if I could figure out the extent of the site. After hitting many metres of buried iron, I eventually happened upon a good patch of relics which kept me occupied for most of the morning.
At last I found my first harmonica cover vs the ton of reeds lying all over the place, branded Weiss, Trossingen - Germany. Other finds include a whopping big chunk of lead (28oz), lead spike, eight buttons, buckle parts, and a few low conductor gold gilded jewellery pieces. I particularly like what appears to be a pair of fern leaves linked together, not quite sure where that piece of jewllery would have been worn as it is very small and quite frail.
The horse stirrup was found on the previous trip, forgot it was still sitting in the car.
That's why I dig all non-ferrous targets on sites like these, you never know what will turn up. It's common to find old relic sites picked over by others, though they often just set their detectors to accept high conductors - more specifically just for coins, and leave the rest of the targets in the ground.
A lot of those smaller jewellery targets found today were reading in the 40-60 range on the Deus, so it does pay to have a look at the lower conductors.
Lump of lead looks the shape of an old iron from on the coke stove,.. maybe what you found was a lead blannk for making a mold for pouring cast iron (just gueesing though).
Who knows, I certainly wasn't going to throw it in my finds pouch, instead I made the missus walk through all the spider webs to take it back to the car.
She didn't have much luck today, all a bit too hot and humid for her liking.
Today I went out with Sheryl to scout out some new locations, didn't have a particularly productive day with some sites cleaned out, and others being near on impossible to locate or identify.
What finds we did manage to get were pretty ordinary, but I thought best to post them in the interest of what evidence to look for when searching for such sites.
On another note, I was going back through my silvers when I found a coin that I neglected to properly identify due to the excessive wear and oxidation way back in March 2015 (sixpence sized coin on the far right, 3rd up in the linked post) https://www.prospectingaustralia.com/forum/viewtopic.php?pid=145119#p145119
After managing to clean it up a bit more, the head on the obverse became more apparent and it appears to be a George III Sixpence, the only detail on the front that matches the pictured original are the two triangles under the crown. So this was in fact my first official George III silver, dated between 1816-1820.