Philatelic Word Of The Day

S20, S30 and S40 Marginal imprints on 170 subject coil stamp rotary press plates that indicated that the outer frame lines on the stamps had been cut shallower to accommodate the new, rotary press method. Although the exact meaning of the markings is not known, the following explanation has been given by Miers and mclemore among others: The normal frame lines had a tendency to bleed when printed from the curved rotary press plates and an experiment was made with the frame lines cut 20% shallower, the "S20" plates.

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