CREATE TABLE table_63993 ("Class" TEXT, "Wheel arrangement" TEXT, "Fleet number ( s ) " TEXT, "Manufacturer" TEXT, "Serial numbers" TEXT, "Year made" TEXT, "Quantity made" TEXT, "Quantity preserved" TEXT, "Year ( s )  retired" TEXT)

What is the serial number of the model made in 1930?
SELECT "Serial numbers" FROM table_63993 WHERE "Year made" = '1930'
SELECT "Serial numbers" FROM "table_63993" WHERE "Year made" = '1930'