1890-1990 Eisenhower Centennial Proof Die Crack ?

I suspect this is not a die crack but if so then it is a minor one. Major Die Cracks on proof coins do command premiums. A "Major Die Crack should extend from the face of the die all the way through the rim to the very edge (and it you saw the die you'd see they extend a ways down the body of the die).

I've seen them start at about $70 to $80 and go much higher. I have maybe 30 of them listed but have not updated the list in years.

I don't think that one as minor as what you show would command a premium but some that I wouldn't classify as a "Major Die Crack" could command a premium if strong enough.

Die cracks on modern business strikes rarely command premiums with some exceptions.

Here is a Major Die Crack on a 2004-S Clad Iowa State Quarter:


Here is another one on an Iawa quarter:


Here is one on a 2005-S Jefferson nickel:


One on a 2005-S Clad Oregon State Quarter:


Here is one on a 2004-S cent:


Here is a 2005-S Clad Kennedy half with Spiked Head Major Die Crack:


Here is a 2005-S Silver Massachusetts:


A 2008-S Bald Eagle Commemorative half dollar:


One on a 2005-S Clad dime:


Here is an actual die from my collection with a Major Die Crack:


I consider these to be a Superficial Die Cracks. Ones like these are very shallow in the die.