Serial number range: 250001-792000 (1935-1950, approx. 11,255 produced). Production by year: 1935: #250001-275000 (3,000 units); 1936: #336001-337000 (1,000 units); 1937: #357001-358000 (1,000 units); 1938: #425001-453000 (2,000 units); 1939: #495001-531500 (1,500 units); 1940: #541501-542000 (500 units); 1941: #580001-580350 (350 units); 1950: #790014-792000 (1,905 units).