I will share with you how the gun was advertised, which by the way I have full confidence is true based upon the source.
"This is a PP-944DAO."..." The pictures show factory lube that wipes off. There is no finish damage."..." This gun is a factory demo thus the "U" with the serial nunber. That is only one of the items that contributes to its rarity. The other is it is a tactical all black version. came direct from the Ruger factory to us, no previous retail sale. It looks to be unfired other than factory testing. It was probably either tested on their range or used as a demo gun at a show or company sponsored outing."
Again, I have confidence in the "story" as told here, but have not found any public reference to this finish specifically, unless I am just not knowledgable enough to know the official name of the finish. Interesting none the less, and fun trying to figure it out!
Thanks all for your responses, interested in more ideas if you have them.