Quote:
Did they send you an explanation saying it was really better that their usual MS64's, but not quite up to MS65 criteria?
Good question and basically correct ... I'll offer what I know with some personal opinions thrown in for flavor.

Within the past few years (not sure of the exact timing) both PGCS and NGC (the top 2
TPG) decided to deploy the marketing tool of 'grades within grades'. Their stated intent ... in my words ... was to differentiate coins that are better than average but not deserving of the higher grade. Just as you stated in you question.

NGC uses a star * .... PCGS uses a plus +.
Personally I think the entire concept is silly ... grading is so subjective that 10 experts will have 8 different opinions on the same coin ... so any attempt to resolve this to a 1/2 grade point is purely a marketing idea and not based on reality IMHO.

This concept of + grading appeals mainly to the registry set enthusiast who is chasing numbers instead of coins.
I purchased this 1934-D because I liked the coin in hand ... not because of the + grade.
That said ... we need to recognize as serious collectors the reality of the marketplace as it is ... and alas this + grading has gained an acceptance and does indeed price a coin higher in most cases than a coin graded at just the technical grade.
PCGS Price Guide for this 1934-D
Peace dollar:
MS64 ...... $650
MS64+ ..... $800
MS65 ...... $1700
Hope that explanation helps.
David
Take a look at my other hobby ...
http://www.jk-dk.art