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_31385 ( "Value" text, "Dimensions" text, "Main Color" text, "Obverse" text, "Reverse" text, "Watermark" text, "Date of issue" text )

### Question ###
What are the dimensions of the coin with western sea barrage and locks at taedong gang on the reverse side?

### Accurate SQL ###

SELECT "Dimensions" FROM table_31385 WHERE "Reverse" = 'Western sea barrage and locks at Taedong Gang'