Went to an old cellar hole a couple weeks ago with FoundationHunter, didn't realize 1 of my finds turned out to be a 1778 Machin Mils Half Penny . I recently started cleaning a lot of my coins when i was doing a hot peroxide bath on this particular coin i was able to start seeing a date on it, i just recently got a new book i bought off Ebay to help recognize a lot of the old coins we can find while cellar hole hunting. This book has a boat load of info.