Scott 583 is a perf 10 rotary press stamp. Booklet pane singles all have one or two straight edges. All of the sheet stamps are perforated on all four sides. Experimental use of the electric eye started in 1935, long after 583 was replaced with the perf 11 x 10 1/2 634 in December of 1926.
Most regular issue flat plate stamps of the period were printed on four hundred subject sheets divided into four panes of 100 along the vertical and horizontal center lines leaving two straight edge margins.
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Posted 09/18/2015 9:19 pm
