Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_25572068_1 (date VARCHAR, series VARCHAR)
### Question:
When was the F4 7 series?
### Answer:
SELECT date FROM table_25572068_1 WHERE series = "F4 7"