Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_15635768_1 ( date_of_issue VARCHAR, face_value VARCHAR )

### Question ###
When the face value is 42 , what was the issue's date?

### Accurate SQL ###

SELECT date_of_issue FROM table_15635768_1 WHERE face_value = "42¢"