Search:

Yes, that is where I'd expect a crack to be on a straight razor, the thinnest part of the blade. On the thick parts of a straight razor, spine/tang, is where you'd see "cold shuts" that appear to be...

I am no expert but that may just be a "cold shut" and not a crack at all. Search "cold shut in forging" on the web. Its been there for a long while without breaking and is likely just cosmetic.

Bob