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_49497 ( "Issued" real, "Type" text, "Design" text, "Serial format" text, "Serials issued" text )

### Question ###
What serial format was issued in 1972?

### Accurate SQL ###

SELECT "Serial format" FROM table_49497 WHERE "Issued" = '1972'