I can't tell from the pic., but if it is from the Civil War, you've got quite a piece. I've debated the U.S.A. Hosp. Dept. items before, after the Civil War, similar items were marked U.S.A. Med. Dept. I have extensively researched Civil War items and I have worked with a museum on Civil War...
I can't tell you much about your site except to say that I've dug a comb like yours from a Civil War site in Northern Vrginia. Keep looking around. It looks like you've got a pretty interesting site.
I don't really know, but many years ago I was in an antique shop in upstate New York where they had many labels on a dispenser. You could buy them one at a time or in large lots. There labels were old but still useable.
CAUTION! CAUTION! CAUTION!
That is so TRUE! I remember our first TV and it was so tiny! As for the grocery stores, I was a clerk at a store in Arlington, Va., and we only had paper bags. Plastic bags? What in the world were they for? It's nice to remember the "past."
Many, many years ago, I used to drive from Virginia to Jamestown and the digging was great. That was over 40 years ago. The roads have changed and the big dumps have been dug, but you'll be in a great location!
Sorry I can't give you the locations, but you'll be in a great area for digging...