Canal Zone Booklet Panes

I am in the process of creating a series of album pages for these and am in need of some assistance from those of you who collect these things.
In researching images of the various booklet panes, I have found that most of the regular issue panes have a vertical orientation. However, I also discovered a few (like 115c) that appear in both a horizontal and a vertical orientation.

1) Is this a common occurrence, especially with handmade panes?

2) Are you aware of any others that can exist in both orientations?

Likewise, some panes exist only horizontal; 31c and 32c, 102a, 163a, and the 3 air post panes (C48a-C50a).

3) Has anyone seen any of these in a vertical orientation?

I also need someone who has some of the early (prior to 1932) Portrait panes to please measure the height and width in millimeters for me. I need an example for both the common vertical and the less common horizontal pane. They are just too expensive (minimum $500) for me to purchase just to ascertain the needed frame dimensions. I have examples from 1932 and later in my collection.

Thank you.


*** Moved by Staff to a more appropriate forum. ***

1) Of course it is, especially when normal stamp sheets are used to make the booklets. So you will have different orientation of panes (staples/stitching on different sides) relative to stamp designs and the cover orientation.

2) These are already known and listed; 117a, 117b for example.

3) There are no "secret" booklets or booklet panes for Canal Zone.

If you are this specialized, may I suggest you borrow or buy a copy of Canal Zone Stamps by Plass/Brewster/Salz, published by the Canal Zone Study Group? It's no longer available direct.