CREATE TABLE table_23039 ("No." FLOAT, "Country" TEXT, "Local title" TEXT, "Format" TEXT, "Start Date" TEXT, "End Date" TEXT, "Episodes" FLOAT, "Premiere/Air Dates" TEXT)

What series number started production on June 6?
SELECT MIN("No.") FROM table_23039 WHERE "Start Date" = 'June 6'
SELECT MIN("No.") FROM "table_23039" WHERE "Start Date" = 'June 6'