First, in terms of the age of a coin, 1978 is not old 
I was 36 years old then.
(I'm now 81. I guess I can all that old
)
I call 1978 coins "modern".
The rotation looks to be about 20°.
For a modern coin that is not a lot.
Modern coins are not interesting until the rotation is about 45° or more.

I was 36 years old then.
(I'm now 81. I guess I can all that old

I call 1978 coins "modern".
The rotation looks to be about 20°.
For a modern coin that is not a lot.
Modern coins are not interesting until the rotation is about 45° or more.