I decided that work was costing me too much detecting time

so this morning I was out of the house at 5.20am and on the field by 6 for a four hour pre work detecting fix, But boy oh boy was it quiet.
This was a new field that I have often looked at and thought.......Ummmmm that does look good, well unfortunately apart from some hunter gatherers, it seems as if I'm the only one who thought it looked good in all of recorded history

I can honestly say it was the quietest field I have ever detected, hardly any iron, lead, buttons..nothing. But the few things I did get I was pleased with.
First to come up was the top of a first century bow brooch, still nicely patterned. Then a strong (ish) signal that read 12 inches which usually means on a Minelab that you have a tiny piece of foil just under the coil, but no the hole was indeed getting deeper which then made me think "horseshoe". Well at a measured 13 inches up came a lovely tombac buckle it was below the plough soil and about 1.5 inches into the clay which had obviously sealed it since it was dropped. I think I can honestly say I have never seen one in such good condition that has come out of the ground.
Neil any ideas of age, use and design???
Then the only coin of the session which is as smooth as a babies bottom but given the lovely nut brown colour I presume it is or was a halfpenny of either William III or James II.
The only other item of note or mystery is the item bottom left in the group photo. At first I thought it was a dandy button but it is far too thin about the same as a hammy, it has writing around both sides, is copper and is huge, just over 40mm in diameter. Any ideas anyone?

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