1925-S cent DDO classification

I have a 1925-S which is DDO, but it also looks to be S/S. Would this carry two different variety attributes or just DDO. Pics attached, but won't have microscope for a couple of weeks, so please forgive the quality. Thanks.

 

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I would classify it as "MD". Looks flat and shelf-like to me.

 

It's not a DDO. It's MD.

 

MD

 

And the 's' as well? Are not the mint marks struck at a different time?

 

Yes the S as well.
Mintmarks were added to the die after the die was hubbed. It's during the hubbing when DDO's and DDR's happen.

 

Thank you for the response/education. As I understand it, any flat doubling is MD and rounded doubling would be true DD. Correct?

 

Here is a good reference on doubling: http://www.lincolncentforum.com/lets-talk-about-doubling/

 

The MM's were struck (for older die production) into the actual die at a different time than the rest of the die but the completed die strikes the planchet producing a complete coin at the same time. ( or else I don't know what I'm talking about and disreguard when someone with real knowledge rips into me)

 

I addition to furrys link, here's another one that covers machine doubling.
http://doubleddie.com/144801.html