Whoa. Spectacular Jack. As for the date there is a large 5 and small 5 variation. This is the small 5.
I assume the little blob of metal under the A is a die chip. Combined with the small 5, that makes this rarer?
I couldn't find any on Heritage or PCGS with that large knob on the tail of the 5 either. The 0 should be thin at the top and the loops of the 8 more oval. Is it supposed to be the small 5 stems?
OK, the die chip under the "A" is always seen on a genuine 1804 C-6 draped bust half cent reverse (image below). A genuine 1805, not so much unless you count the CN ones...