Dingwerth gives the following numbers in his "Schreibmaschinen-Lexikon für die Zeit ab 1940". Dingwerth states that the first year of manufacture is sometimes not precise. 1964-01-01 5,000,001 1965 1966-01-01 5,034,216 1967 1968 1969-??-?? 5,180,000 1970-??-?? 5,227,000 1971-??-?? 5,283,000 Carlo Torchio gives in his "Olivetti. Macchine per Scrivere Meccaniche" the following numbers. 1965-01-01 5,000,001 1965-12-31 5,034,215 1966 1967 1968 1969-12-31 5,180,000 1970-12-31 5,227,000 1971-12-31 5,283,000 1972-12-31 5,333,117 1973-01-01 5,333,118 The Typewriter Database gives us the following informations: 1969-??-?? 5,180,000 1970-??-?? ...