Is this a ddo coin

It's either mechanical doubling or die deterioration which are not the same as hub doubling and not considered errors by most specialists

There are lots and lots and lots and lots of MD and DDD out there, but very few true doubled dies. Trying to learn and understand the characteristics of each will save you a lot of time and frustration. It takes time and effort, but if you want to search for doubled dies, it is well worth it

Here are some links that are worth reading and studying

https://www.doubleddie.com/58222.html
https://www.doubleddie.com/144801.html

Also take a look at the doubled die listing on that site so you can get some experience with true doubled dies

Yes, it is important to show the entire coin, both front and back to get an honest opinion on when questioning a DDO coin.
Wayne