After a couple of hours without a decent find I decided to try something different. I dug targets based only on how they sound as they discriminate out and discriminate back in again. I ignored what the dial showed when they discriminated out and in. I read that Tesoro machines tend to disc out trash with rougher sounding edges and good items disc out more smoothly and disc back in faster giving a full "round" sound almost instantly. After a short time I got that "good target" sound, I looked at the discriminator's dial on my Tejon after I decided to dig the target, it was just above pull tab but well below screw cap. On my machine this is below where zinc pennies discriminate out. When I dug the target I got a 1952 Washington quarter that was about 3" deep, laying in it's edge at about a 45 degree angle. There was a 1962 nickel on top of and in direct contact with the quarter. Pictured below you can see the patina on the face of the quarter that the nickel left on it. I have never seen my Tejon "mask" a target like that. In all my tests it always read silver high, even on Monty's nail board it read silver coins high. I learned a different way to hunt and can't help but wonder how many people with display detectors passed over these coins.