CREATE TABLE table_58103 ("Year" FLOAT, "Driver" TEXT, "Constructor" TEXT, "Location" TEXT, "Report" TEXT)

What was the constructor of the car that Achille Varzi drove before 1937?
SELECT "Constructor" FROM table_58103 WHERE "Year" < '1937' AND "Driver" = 'achille varzi'
SELECT "Constructor" FROM "table_58103" WHERE "Driver" = 'achille varzi' AND "Year" < '1937'