To build on eyeonwall, all you need is a pair to show the unaltered division between stamps, of course, a full pane is more satisfactory for most collectors, but the pair would do.
I believe that Parcelpostguy and eyeonwall are correct. A pair or more would be needed to see the horizontal scoring. This image is from a complete booklet pane with scoring.
Scoring on this booklet BK157 issue is a mixed bag. From my collection of around 30 booklets, I note: a) Plate 11111 Usually panes are heavily scored in all horizontal rows. Some panes may show very weak scoring on the 2nd and 4th row. b) Plate 2122 Many panes show massive horizontal scoring shifts, sometimes up to 2mm above the horizontal perf holes. Some panes show double scoring, one slit row up to 2mm above the holes, the second slit row through the perfs. Some panes show some weak vertical scoring slits, but a few strong slits between the top two stamps. c) Plate 2222 Panes are scored at the third row only where the panes are folded into the booklet. This is often masked by the fold if it goes through the slits.
I do not have a single pane that is completely unscored. Sometimes the scoring slits are shifted horizontally so most slits if not almost all slits are actually "hidden" inside the perf holes instead of (more or less) horizontally connecting the holes.
One might (and I repeat might) be able to tell with a very high power glass and some practice at looking at the perfs of a number of examples. It should be possible over time. A 40x should be able to see the scoring on at least a few perfs.
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