The ink on the numbers looks the same as the rest of the text to me, so I've always assumed it was done by the original scribe, but I don't think that's a consensus view. I know I've seen it asserted that the numbers are a later addition.
There's a pattern repeated three times in the column of letters that goes p/f - o - r - y - "e" - "hook". The numbers are next to the last five letters in the first instance of this pattern.
66r and 76r also have columns of letters.
There's a pattern repeated three times in the column of letters that goes p/f - o - r - y - "e" - "hook". The numbers are next to the last five letters in the first instance of this pattern.
66r and 76r also have columns of letters.
![[+]](https://www.voynich.ninja/images/collapse_collapsed.png)