These are Proof coins. Notice the fields of the coins are very highly reflective, the details are quite sharp and the rims are very square where they reach the field level.
Also, most Proofs after 1968 have the S mintmark, before, they have none.

Proof 1968-S (and if it has no S)

This is a regular Business struck 1968-D

Edited by Crazyb0
08/02/2018 6:41 pm