what type of doubling is this?

M/D or S/D? all 5 letters in 'trust' are doubled to the north and to the east with the tops of all the letters being twice as wide as the lower half. the tops of both Ts go up almost into the rim. '25 d.

 

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I believe it is known as die erosion doubling. The doubling on the letters "R" & "S" looks a little like mechanical doubling. The experts would probably want to see the entire obverse & reverse image. Also, you would probably find some expert opinions in the error coin section of CoinTalk.

Here is one of my favorite DDR coins.

 

ah. i forgot about that one. makes sense, its on a "ghost lincoln".

 

a deteriorating die can cause all kinds of mischief.