What is PR65 grade for coins?

PR stands for Proof, and 65 is the numeric subgrade indicating how well-struck the coin is. Numeric grades within the PR category range from 60 to 70 so a PR65 coin would be an average proof. That of course is still a very, very impressive coin because proofs are specially struck made using highly polished blanks and dies. The coins have mirrorlike or sometimes cameo surfaces. Proof coins aren't meant for circulation; they're normally put into sealed packaging and sold directly to collectors.

PR70 is an almost unattainably perfect strike. Very few coins are ever graded PR70.