Picked this up for a song on Ebay (under $10). I think it's a DDO. Check the images. Couldn't get a good pic of the nostril doubling, but the ear especially seems to match the DDO specs. Doubling at ear by iontyre posted Jul 1, 2015 at 5:25 PM Doubling at braid by iontyre posted Jul 1, 2015 at 5:25 PM Cropped 75% by iontyre posted Jul 1, 2015 at 5:25 PM
If the man who posted before me says it is, it can't be anything but a DD. I'm not sure I've ever seen him say anything besides MD! :-D
How did it happen? Are there superimposed portraits on the die, like superimposed letters or dates on other DDOs? Is this one portrait on top of another on this die? I think that's what you're saying. You can tell me, I won't let anyone know, lol.
It happened the same way as the famous 1955 doubled die, and any other one. The die was impressed twice, as is/was normal, and there was movement between the two impressions.