Question: Which artist's work is the butterfly Tiger Swallowtail?
SQL: SELECT "Artist" FROM "2-11916083-23" WHERE "Butterfly" = 'Tiger Swallowtail';

Question: Which artist uses a finish of Selective Gold Plating?
SQL: SELECT "Artist" FROM "2-11916083-23" WHERE "Finish" = 'Selective Gold Plating';

Question: What mintage earlier than the year 2006 has the butterfly Great Spangled Fritillary.
SQL: SELECT "Mintage" FROM "2-11916083-23" WHERE "Year" < 2006.0 AND "Butterfly" = 'Great Spangled Fritillary';