CREATE TABLE table_name_1 (works_number INTEGER, date VARCHAR(255), number VARCHAR(255), type VARCHAR(255))
Which Works number has a Number larger than 807, and a Type of 0-6-0, and a Date of 1920?
    
SQL: SELECT AVG(works_number) FROM table_name_1 WHERE number > 807 AND type = "0-6-0" AND date = 1920