After a failed effort on a 1947 nickel I made extra sure on this one. Yes, it is an honest DDO-001 and possibly quite rare as it is not on Brian's site.
Although I am not looking at many of the nickels other than for Hennings, I glanced at this one for no particular reason and thought I saw more MD. But no, put it under the scope and it's the real deal. Fairly strong doubling across all obverse devices.
1949-S Jefferson nickel
doubled die DDO-001 (die marker is die scratch through W of WE)