CREATE TABLE table_17597 ("Year" FLOAT, "Denomination" TEXT, "Alloy" TEXT, "Reverse" TEXT, "Diameter" TEXT, "Weight" TEXT, "Obverse" TEXT, "Mintage" FLOAT, "Series" TEXT)

how many reverse with series being iii series
SELECT COUNT("Reverse") FROM table_17597 WHERE "Series" = 'III series'
SELECT COUNT("Reverse") FROM "table_17597" WHERE "Series" = 'III series'