63 stamps, 3 pairs, and 25 blocks, mix of mint, cancelled to order, and postally used, demonstrating essentially all major alignment varieties of this issue, including "O" of "Official" over "N" of "Panama", "O" of "Official" over second "A" of "Panama", first "F" of "Official" over second "A" of "Panama", and "L" of "Official" over first "A" of "Canal", all neatly written up on exhibit pages, very fine, an incredibly comprehensive collection for the specialist