Hey Kirk,
Welcome to the Capped Bust Club! Definitely a rare find, and as Don said, one to be proud of, since finding them is such an uncommon occurence. I know this is your post, but please allow me to describe how I felt when I found my second Capped (the first was a holed 1814 dime, that came early in my MDing career and I didn't realize how rare of a find it was). Back in April of this year, my MXT got a straight on penny reading at three inches. Never, did it flash through my mind that the target was going to be anything better than a cent coin. When I came up with an 1829 Capped Half Dime, it was almost the biggest rush of anything I ever dug. Number one on the list is my first real old coin (an 1802 Large Cent) that I dug with my Prism II, about four months after getting involved in this hobby. So again, congrats on the bust, and it just goes to show that, persistence and determination and hunting the right spots will pay off with some exciting finds!