Pane Delineation Guide Dots

These pane delineation guide dots are relatively common, but they are quite 'collectable'. Only a few atypicals along with some representitive examples are shown herein. Plate positions for most are unlikely to ever be established.

Pane delineation (PD) guide dots are reference marks used to define the positions of panes on steel-engraved printing plates. A standard plate carries five PD guide dots: one at the center where the four panes meet, two placed midway between the left and right sides of the plate in or near the top and bottom stamp rows, and two placed midway between the top and bottom of the plate in or near the left and right stamp columns.

These five points establish reference axes that divide the sheet into four panes, hence the term pane delineation guide dots. On some plates, faint horizontal and vertical guidelines physically connect these dots, further clarifying the top–bottom and left–right divisions of the plate. PD guide dots are found on many, but not all, sheet, booklet, and coil plates, and always occur in the same relative positions regardless of format.

Although plating solely from PD guide dots and guidelines is rarely practical, their presence contributes valuable evidence for reconstructing plate layout and, in combination with other markers, for assigning stamps to specific positions.

(Generated from information provided by Leopold Beaudet.)