In recent years Royal Mail has copied the US practice of having a grid in the margin, divided into 4 or 6 squares, one of which has a dot in it, indicating the position of the pane in the overall sheet.
This is how some dealers are able to sell gutter pairs, although when the gutter is vertical between two different sets of 5 stamps, that makes for a long gutter strip! This is a view of part of three double-sheets:
It isn't easy to see in this but the grid positions are:
Upper sheet: position 2 - position 3
Middle sheet: position 3 - position 1
Lower sheet: position 1 - position 2
You can see it more clearly here:
Now, if the panes are printed in three positions horizontally, one would expect that one pane (say position 1) would be guillotined off for counter sheets, leaving the other two for philatelic distribution. As the print run would produce more double-panes than would be necessary for philatelic distribution, a large number of the pairs of panes 2+pane 3 would also be guillotined for distribution to post offices.
So why have we got all three possible combinations? We have -
Pane 1 + pane 2 (lowest)
Pane 2 + pane 3 (uppermost in this picture), and
Pane 3 + pane 1 (centre).
Is the cylinder circumference in fact 6 panes round, with positions 1, 2 & 3 duplicated?
Does the grid mean anything at all?
Should we revisit previous grid markings - including for definitive and country stamps - to review what they mean?
Please leave your suggestions as comments!
In the absence of comments I'll suggest a fourth possibility - in fact more like a probability:
There are three panes to a cylinder with a gutter between each, but they are cut into sheets of 2 panes - 1+2, 3+1, 2+3, 1+2 ... etc.
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