Before someone else says it, the correct term is "doubled die." And no, I think what you are seeing is the result of a harsh polishing/cleaning.
Yeah I suggested the coin to be something. I can't quite remember but on some Lincoln cents isn't there the same type of "error" in the date?
Doubled dies would be varieties and not errors. Doubling in the date could be from many causes, such as mechanical doubling, die deterioration, a weird lighting angle, etc.
What you may be thinking of are RPD ( repunched dates). In the older series such as Morgan Dollars and especially the IHC, the main devices were pressed from hub die to working die and so could produce regular doubled dies, but the date, mm, was added with a punch by hand. So RPMs ( repunched mintmarks) were also possible. Some sources mention RPD in Morgans as Doubled dates ( VAM) , even thought they occurred differently from the regular DD of the main devices. You can have a IHC 1873 Doubled die ( DD liberty in main device) regular dated Cent , and a different cent of 1873 IHC RP Date Cent (with non DD Regular liberty). So no, it is not a DD.
The lack of toning below the date is very common on Morgan dollars. As a matter of fact, you can often see it on the outer side of the stars. It is not a DDO or RPM. Chris
Rick, The lack of toning under the date has no bearing on any VAM which is assigned. You didn't mention it, but I assume that yours is a 1904-O. The 1904 (Philly) VAM-8 is a proof. Chris
its the proof, the only image I couldn't catch was the polish line in the 9 of the date, 250x just won't do it