Royal artillery, a wren and an emu

Today’s dig was near Henfield. The first thing to greet us was an emu trotting around the farmyard. In the afternoon it followed me, pecking at the grass in the divots as I dug them. My finds were:
• three and a quarter buttons, including the Royal Artillery button below. It is early 19th century, copper-alloy, 16.5mm diameter;
• a lead seal, with JC 1800 on one side
• A copper coin, well worn and clipped, 28mm, which I finally identified as a George II halfpenny c 1750
• a 1941 farthing with a wren on one side and a modern £1 and ½p
• a lead weight, 1¼ oz, a harness mount, a KIA-ORA bottle cap, a drawer handle and a Chad Valley child's pail in 2D! (below)