I bought a new scale and after calibrating it I started weighing sometimes from the 1970s and just felt "off". They are mostly late seventies and consistently weigh 2.9-3.2 grams. Nothing under the scope appears unusual just their weight. There are 4- 1703D, 2-1975 nmm, 2-1977D, 2-1978D, 1-1978nmm & 1-1979D.
I weighed well over 100 different dimes some silver, some not that weighed what they were supposed to. Anyone have any answers as to why they would weigh so much?