I think that finding a US plate by anyone would be a GREAT find How's the back look? Most of us will never find one of those and there are fewer that do. Job well done, and welcome to the site
The plate is nice...especially it's condition....but the find is the Whitworth. I would trade any of my plates for it, as I have never found one of those rare bullets before. Congrats, and welcome to T-net. I look forward to more great relic recoveries from ya!