Proofs are graded using a PR designation, to distinguish them from business strike coins. A business strike coin with a grade of 67 would be much rarer than a proof coin with that grade hence the need to differentiate the grades to some degree.
Also, proof Roosevelts are not given the FB designation because it's assumed they will always have FB given their different manufacturing and handling procedures.
As to population, according to PCGS
has 604 at PR67 and 287 at PR68 for the non DDO
As for the DDO
, there are a number of DDO
's for that year (at least 17) so much better pictures of the date and motto are needed to help you with that determination.
Edited by HGK3
08/15/2020 12:29 pm