Serial number range: 167001-504500 (1933-1939, approx. 127,950 produced). Production by year: 1933: #167001-195000 (5,950 units); 1934: #195001-230000 (17,000 units); 1935: #237001-283000 (18,900 units); 1936: #284601-336000 (23,300 units); 1937: #345001-411000 (34,800 units); 1938: #418001-485000 (24,500 units); 1939: #496001-504500 (3,500 units).