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

which stamp set had only three cards in the set ?
SELECT "stamp set" FROM table_203_153 WHERE "#cards" = 'three'
SELECT "stamp set" FROM "table_203_153" WHERE "#cards" = 'three'