I am new to coin collecting. I found a 1986 D penny that I am not sure if it is machine doubling or doubled die. I also found a 1963 D dime that I am pretty certain is a double die.
That dime reverse looks good to me. Split serifs. Not flat. You may have something there. I want to know more. The obverse looks like a plain old dime. Can you post a good close up of the whole reverse? The cent? Nah.
Actually that is a 1963 dime I also have a 1963 D dime with the same type of doubling. They are from some coins I collected when I worked for a bank back in 1988. A customer had deposited several rolls of silver coins( quarters, dimes and halves) I bought them and have now started looking through them for errors.