1970 D dimes with reverse of 1968?

While going through some coins from my mother’s collection, I came across these two dimes.

After some research, I believe both of these dimes may have the reverse of 1968.

Hoping someone will be able to confirm?

 

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What's the difference between the reverses of 68, 69 and 70?
Have not heard of this variety.

 

What's the difference?
I never heard of .. Reverse of 1968 on 1970 Dime

@Michael K
You beat me by seconds with the response!

 

Birthday magic.

 

Here’s some info on this variety:

http://www.error-ref.com/transitional-reverse-1969-1970-dime-with-proof-re/

http://www.varietyvista.com/07 Roosevelt Dimes/Reverse Design Varieties.htm

Variety Vista indicates this variety is rare which may explain why you’ve not heard of it.

 

Here’s some info on this variety:

http://www.error-ref.com/transitional-reverse-1969-1970-dime-with-proof-re/

http://www.varietyvista.com/07 Roosevelt Dimes/Reverse Design Varieties.htm

Variety Vista indicates this variety is rare which may explain why you’ve not heard of it.

 

Ok.. Now I've heard of it.
You need better pictures than the ones you provided. Too blurry.

 

Ok, I’ll take pictures of them individually and post.

 

Why would they skip 69 and use the reverse dies of 68?
And, did they make a design change between 68/69/70?

 

Here’s new pictures, as requested.

 

The high relief design was to be used on proofs, but apparently, you can find it on 1969 and 1970 dimes.

 

I could see a one year overlap but not two years. Seems like the dies from 68 would have been destroyed or stored before 1970. Maybe I'm missing something.

 

Here’s a video on YouTube that explains it better than I could: