I know its just a wheat penny (193but its my first with my new to me explorer.And it came from my house that I went over with my fisher 100 times.I also found 3 quarters and 2 dimes and 2 other pennies.Now that really tells me this machine is great. Now earlier yesterday I went to a park that was in use since the late 1700s and didnt find anything but 3 old and deep rusty nails but the signal was a little iffy but I dug anyway.I couldnt get any other signals,I dont think I crossed over anything "good" as I spent 2 hours on an area about 40 by 60 feet. And there was alot of trash there also.I should have put the 6in coil on.I did as suggested,by the book from andy and it should be here any day now so im hoping that will assist me in the learning curve of the differant sounds. But I think im getting the hang of it.