Well, I wouldn't say for sure.
It seems like there could have been two folios there, but it is still
plausible that the left stub is part of f73v. The right stub may be from a
separate f74r/v, but
I'd still lean toward it being the left edge of f75r. Normal gutters are the
result of a single
sheet of vellum folded in the middle; I think when a half sheet of vellum is
inserted it makes it
difficult to bind into the gutter and requires a little slack on both the
left and right pages
being joined. I'm not saying that there aren't two sheets of vellum missing
from there, just that
I'm more convinced that f73r/v was a piece of the same sheet of vellum that
made up f74r1/r2/r3/v3/v2/v1,
and the number 74 was written on the top right of f74v2, while the quire
number 12 was written on
the bottom right corner of f74v1.
Pure speculation... but with only two months missing and the 'possibility'
of 6 missing panels leaves
room for the two months and 4 charts similar to the start of the zodiac
section like 69r/v, 70r1/r2; for the
sake of symmetry.
John.