My thoughts on the depth of old coins,......... it is a decision of what is exactly 'deep' at the location of where you are detecting at. If you are fortunate to be hunting an old virgin spot that has not been hunted before, I would'nt care if the depth meter on an id machine said it was 4 inches or less, I'd be digging it. For instance, a buddy and I were hunting an old house that dated to about 1890, he was concentrating on the soft deep signals, and coming up with some nice older wheat pennys from the early teens. I noticed he would be checking out some signals and then passing on them. Well I started checking out some of the targets he was passing on. I got a fairly strong dime signal on my machine, and called out to him why he had walked over it.He said it was probably a clad dime, since it was shallow, so I proceeded to dig it up, and whadayaknow it turned out to be an early Mercury dime at about 3 inches deep. So I kept following in his foosteps and found two more silver dimes, one a Barber and another early Mercury in the teens, these were about 4 inches deep. Then I walked up to him to show him what he had been passing up. He then got all pi$$ed off and went to the car to drink a beer. Just keep passing on those shallow targets and some kid with a Radar Shack detector will show you up! HH.........Hombre