1957 D DDO on date?

Good morning folks. I just came across this 1957-D with doubling on the date. I've looked around but didn't see anything comparible. Any help identifying this type would be helpful.
Thanks Foo
Also has a die chip in the bottom of the B in LIBERTY.

 

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I would call it machine doubling.

 

Nice find.

 

Thanx. Still looking and learning.

 

flat an shelf like.. its MD..

 

One of the most common dates with
'nice' mechanical/ejection doubling.

 

Thank you Mr Weinberg. I've seen many comments about you being the man to see about things like this. Thank you for chiming in. Any suggestions as to sites I can visit, or articles i can peruse? Im really trying to get a leg up on this doubled die, machine doubling, deteriorating die decathlon. Lol
Thanks to all,,,,, Foo

 

@FooFighter There is a section on Wexler's site called Worthless Doubling. It has some good info on how to spot the differences

https://doubleddie.com/

 

MD but with a nice worn die chip.

 

Yea that die chip put a lil BASS in the B.

 

@Oldhoopster Yes sir. It's funny you bring up that site. I checked it out the other day, and spent more hours there than I should have! It's my new favorite site. Hell, you can even buy coins there.
Thanks Bro, Foo