CREATE TABLE table_79950 ("Name" TEXT, "Circuit" TEXT, "Date" TEXT, "Winning driver" TEXT, "Winning constructor" TEXT, "Report" TEXT)

When did Gaspare Bona win the Pozzo Circuit?
SELECT "Date" FROM table_79950 WHERE "Winning driver" = 'gaspare bona' AND "Name" = 'pozzo circuit'
SELECT "Date" FROM "table_79950" WHERE "Name" = 'pozzo circuit' AND "Winning driver" = 'gaspare bona'