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  • $\begingroup$ the second cell from top left should read 56 and not 58, it looks like someone overwrote the lower values with black ink $\endgroup$
    – sousben
    Commented Sep 26, 2017 at 13:24
  • 1
    $\begingroup$ preliminary comments: lower numbers are consecutive from bottom to top cells and from right to left. 8 consecutive upper numbers appear on each row but not in consecutive order. the order of the rows is 3,2,1,4,5,8,7,6 $\endgroup$
    – sousben
    Commented Sep 26, 2017 at 13:28
  • 5
    $\begingroup$ It certainly looks like a transposition cipher or a grille. en.wikipedia.org/wiki/Grille_(cryptography) $\endgroup$
    – LeppyR64
    Commented Sep 26, 2017 at 16:05
  • $\begingroup$ Thank you sousben and LeppyR64. Yes you are right about the 56/58 as I see 58 is already there. Thank you for the link too. $\endgroup$
    – Breebeg
    Commented Sep 30, 2017 at 8:53
  • $\begingroup$ Has a correct answer been given? If so, please don't forget to $\color{green}{\checkmark \small\text{Accept}}$ it. If not, a response to the answerer to help steer them in the right direction would be helpful. $\endgroup$
    – Rubio
    Commented Oct 11, 2017 at 14:21