I have got this 1930 S LWC DDO-001 stage C and while not a very well known DDO it is fairly scarce as only 9 have been attributed. All the die markers match for the stage C. Its a shame about the carbon spot but it will fill a hole.
It's a tough bit of doubling to see. Mine is not attributed but MS-64 in an NGC slab. Should probably see if they would add DDO-001 to the slab if I sent it to them as I think they will do some non-FS varieties.