1955-S DDO?

I don't see doubling.

Your images aren't clear enough to give an honest and complete opinion, but from what I can make out, it looks to be Machine Doubling. Clearer pictures will help

A few things to note;

There is a website called http://www.coppercoins.com that will assist you in identifying whether the coin is a doubled die or not. Look to the top left in the navigation pane for "die variety search" or words to that effect. On the next page, in the top box, put the year and then check the box for the mint mark you have, then hit go.

Another site called http://www.errorvariety.com/OFD/MD.html will assist you in determining whether or not the coin suffers from Machine Doubling or not.

Basically, Machine Doubling damages the coin. It may give an appearance like a doubled die, but it is not. Typically the numbers and/or letters will have some of it removed, and possibly lowered. Machine Doubling was very common in the 1950's through the 1970's.

The "R" looks like is suffers from a Machine Doubling, meaning that the actual "R" is not its normal size. Its defiately not larger than normal, or showing a heavy thickness.
The "1" looks like it suffers from Machine Doubling, just the corner of the "1" is actually removed - which takes away from a device - meaning that its more than likely Machine Doubling.
Machine Doubling is common, and considered "damage" vice abn error, and has no additional value.

As for the camera. Check to see if the camera has a MACRO setting. It is sometimes represented by a flower. Turn on macro and it will allow for better close up pictures.

here is more clear shot... thanks