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CREATE TABLE table_21819 ( "SECR No." real, "SR No." real, "BR No." real, "Builder" text, "Date Delivered" text, "Date Withdrawn" text )

### Question ###
What is the withdraw date for secr no. 771?

### Accurate SQL ###

SELECT "Date Withdrawn" FROM table_21819 WHERE "SECR No." = '771'