I Might have discovered a new over mintmark!

Look at this 1978 proof Eisenhower dollar I found! I think itoght be a S over D.
( sorry for the bad lighting)

 

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Looks like the blob S to me but wait for others who know Ike's better than me.

 

its a filled s which is fairly common given the very small size of the mintmark. if it was an over mintmark it would be called an s over d because the correct mm is the s

 

The mint was notorious for 'blobby' mintmarks at that time. I don't think it's an over/undies.......

 

Ah, sry. Just got this, and the mint mark looked a bit like a d under it. Thx though!

 

Glad to have you 'aboard', Blunt fellow.........

Killer photogs.

 

There's no reason for a D to already be on the special proof blanks that were in San Francisco.
In the case of some of the other older S over D or D over S Philly was putting the mintmarks onto the other mints master dies. But they stopped doing that.

 

Nice coin.