the old house ive been working on has not been good. beside a 44 henning counterfeit nickel last weekend and this 68 finland one penni today, nothing but clad. all late 60's coins and not one silver. ran a more than usual neg. GB today and i tell ya it really hit these coins well in the trash. i balanced it in all metal until when i pumped the coil down there was no sound. where the manual and videos say to adjust it higher. i know when you switch into disc, it ends up a little more pos. so i do adjust it a bit more neg. anyhow, i really went neg. today for a laugh. it worked out well. or, i just have not been enough neg. all this time. im gonna try it for a while, see what happens. the 68 finland one penni is in awesome shape with a neat design on it.