U. S. Unused Plate Blocks of 4 and 6
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                 408 - HR
  611 - Left - crease at left                                                  611 -  right
                              644 - NH                                                                                     657 - NH
These will show up on the used blocks pages also. I just thought that the pair, right and
left, with the same plate number was neat enough to warrant double exposure.
                                681 - NH                                                                             682 - NH
                583 - LH
611 - pre-cancel - another neat
PB that will also be featured
on the used pages.
      636 - NH                                                  637 - NH
                    688 - NH
                   734 - NH
        638 - OG                                                   639 - NH                                                                642 - NH
           759 - Catalog number written in ink on rev
                       762 - ngai
                 763 - ngai
               761 - ngai
                       749 - NH
                     481  - NH