From the H.N. White website:
http://www.hnwhite.com/Serial%20Numbers.htm

Cleveland and American Standard Serial Numbers:
Date Serial Number
1919-1930 1-10,000
1930-1935 10,000-30,000
1935-1940 30,000-40,000
1940-1945 40,000-45,000
1945-1950 45,000-50,000
1950-1955 50,000-65,000
1955-1960 65,000-100,000
1960-1965 100,000-160,000
1965-1970 160,000-420,000