1969 Quarter Die Break

Looks like a common die crack. die break
An area of a coin that is the result of a broken die. This may be triangular or other geometric shape. Dies are made of steel and they crack from use and then, if not removed from service, eventually break. When the die totally breaks apart, the resultant break will result in a full, or retained, Cud depending whether the broken piece falls from the die or not.
die crack
A raised, irregular line on a coin, ranging from very fine to very large, some quite irregular. These result when a hairline break occurs in a die
John1

Yes, they are relatively common, more common in some types than others.

I'm going to suggest a different possibility.
It looks like the die got damaged by something (small piece of wire?) getting caught between the die and a planchet during an earlier strike.
That would also create a mark on the die which would show as a ridge on subsequent coins.
Why do I think this is a possibility?
-- the ridge is too regular; die cracks are generally a bit more ragged.
-- die cracks like that generally extend to the rim.

Something to consider.