user: Question: Which Quantity has a Type of E h4v, and a Year(s) of Manufacture of 1920–1924?
Columns: ['Class', 'Number(s)', 'Quantity', 'Year(s) of Manufacture', 'Type']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['C II.1', 'names', 68.0, '1861–1868', 'C n2']
SQL:

assistant: SELECT "Quantity" FROM "Table" WHERE "Type" = 'E h4v' AND "Year(s) of Manufacture" = '1920–1924';