CREATE TABLE table_name_87 (quantity INTEGER, type VARCHAR(255), year_s__of_manufacture VARCHAR(255))
Which Quantity has a Type of e h4v, and a Year(s) of Manufacture of 1920–1924?
    
SQL: SELECT MIN(quantity) FROM table_name_87 WHERE type = "e h4v" AND year_s__of_manufacture = "1920–1924"