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_16437 ( "Pilot car No." real, "Colour" text, "Serial No." text, "Engine No." real, "Registration No." text )

### Question ###
What is the number of colour with the regisration number of mg-509?

### Accurate SQL ###

SELECT COUNT("Colour") FROM table_16437 WHERE "Registration No." = 'MG-509'