Peace dollar question/red book

Good evening , i was given a 1934 peace dollar tonight and having not seen one from the 30's before i checked it out in the red book.My question is why does the 1934 have similar mintage figures yet the S mint ones are valued far higher in better grades ?It is a lower mintage but not by huge numbers.This is a D mint and yes , without my glasses i got a little interested when i seen a mintmark.
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