This one is sharp. I've compared my early one with the "black Rim", both are quite sharp.
One trick on the collapsible Nikkor: using a lens hood also makes it easier to change the F-Stop. The mechanism does not firmly lock the lens into place like a Summar, Summitar, or Summicron. So on this lens, and on my own, holding the lens in place using the lens hood while changing the F-stop prevents the lens from rotating out of the lock position.