SCHEMA:
CREATE TABLE table_name_1 (works_number INTEGER, date VARCHAR, number VARCHAR, type VARCHAR)
USER:
Which Works number has a Number larger than 807, and a Type of 0-6-0, and a Date of 1920?

QUERY:
SELECT AVG(works_number) FROM table_name_1 WHERE number > 807 AND type = "0-6-0" AND date = 1920