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how many copies of this variety were issued?
none were issued.
The few copies that exist most probably came from the personal files of Charles Skinner, and very likely entered the philatelic marketplace through Hiram Deats. For a time they and all the Continental grill items were kept in a single holding, much (or all) of which appeared in a Worthington sale in 1913. After that they were dispersed, apparently without notes on quantities having been kept. The total number of this particular stamp is far less than 100.