I have had a lot of coins with this across the reverse of, where the STATES, E, dots, and OF, seem weak. All were 1968's, 69's, 70's and 71's. Some more and some less than others. The first pic is a 68 I think, and the second is a 71 I thought grease die at first...buuuuut...now I'm confused.
This is a common weak spot for these older high relief LMC's. It is due to Abe's lapel requiring so much metal to fill. It is also a common weak spot on the reverse of wheat cents.
Ohok..that makes sense. I have some 72's that are this way also. Learned something new again! Thank you!