CREATE TABLE table_203_153 (id DECIMAL, "stamp issue date" TEXT, "stamp set" TEXT, "#cards" TEXT, "card set ref" TEXT, "qty. issued" DECIMAL)

which was the only stamp set to have more than 200,000 issued ?
SELECT "stamp set" FROM table_203_153 WHERE "qty. issued" > 200000
SELECT "stamp set" FROM "table_203_153" WHERE "qty. issued" > 200000