In 2007 a batch of rare major error coins came out of the Denver mint. There were a few dime die caps in the group. This one stood out to me as a super rare, very low mintage, satin finish that was struck by dies specially made for the Special Mint Sets (SMS). The photos clearly show that the coin has a satin finish. The mintage for the SMS 2007 D Dime is 895,630 versus 1,042,000,00 for the 2007 D regular finish dimes struck for circulation.
The obverse die cap has expanded quite large and also split making it look kind of like Pac-Man.