I see this mark beside stamps every so often,is it a guide mark,it must be for flat plates because this picture is a 11 X 11,if it's a rotary sheet mark it's a 595 which is doubtful I found one.
The red vertical bars are the electric eye markings to aid in accurate perforating. Thus rotary press, Scott 634 and perf 11x10.5 See the introductory pages of the Scott US Specialized catalog for additional explanation.
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Posted 01/16/2017 1:40 pm
