| Seidel & Naumann | |||||
| Fahrraeder- und Naehmaschinenfabrik Seidel & Naumann AG, Dresden, Germany | |||||
| Since 1954: VEB Schreibmaschinenwerke, Dreden, GDR | |||||
| Models and s/n | Y | M | D | Remarks | Ref. |
| Ideal Standard | |||||
| Model A1 | |||||
| up to 200 | 1900 | First German 4 key-rows machine | 10 | ||
| Model A2 | |||||
| up to 1400 | 1901 | 7,10,13 | |||
| 3600 | 1902 | Since 1902: "Ideal Polyglott" Models, with multi-language writing (double shift and sometimes only capital letters, depending on the second language), 42 keys up to 200 different characters by combination | 4,7,10,13 | ||
| 8500 | 1903 | 7,10,13 | |||
| Model A3 | |||||
| up to 16000 | 1904 | 10 | |||
| 24000 | 1905 | 10 | |||
| 32000 | 1906 | 10 | |||
| 40000 | 1907 | 10 | |||
| 52000 | 1908 | 10 | |||
| Model A4 | |||||
| up to 66000 | 1909 | 10 | |||
| 76000 | 1910 | 10 | |||
| 84000 | 1911 | 10 | |||
| 91000 | 1912 | 10 | |||
| 96000 | 1913 | 10 | |||
| 98000 | 1914 | 10 | |||
| 99000 | 1915 | 10 | |||
| 100000 | 1916 | 10 | |||
| 102000 | 1917 | 10 | |||
| 103386 | 1918 | 10 | |||
| Model B | |||||
| up to 500 | 1912 | 10 | |||
| 3000 | 1913 | Some Model B's are also known as Model No. 5 | 9 | ||
| 6800 | 1914 | 10 | |||
| 8000 | 1915 | 9 | |||
| 12000 | 1916 | 9 | |||
| 14000 | 1917 | 9 | |||
| 19000 | 1918 | 9 | |||
| 25000 | 1919 | 9 | |||
| 30000 | 1920 | 9 | |||
| 93000 | 1926 | 1921- 1926 machines with large carriage | 9,10 | ||
| 95000 | 1927 | 9,10 | |||
| Model C | |||||
| up to 33000 | 1920 | 9,10 | |||
| 43000 | 1921 | 9,10 | |||
| 59000 | 1922 | 9,10 | |||
| 72000 | 1923 | 9,10 | |||
| 81000 | 1924 | 9,10 | |||
| 100000 | 1925 | 9,10 | |||
| Model D | |||||
| up to 101000 | 1925 | 9,10 | |||
| 110000 | 1926 | 9,10 | |||
| 124000 | 1927 | 9,10 | |||
| 137000 | 1928 | 9,10 | |||
| 150000 | 1929 | 9,10 | |||
| 263000 | 1930 | At 22000 all Ideal Models began to be numbered consecutively. | 9,10 | ||
| 275000 | 1931 | 9 | |||
| Model DZ1 | |||||
| up to 264000 | 1931 | 9,10 | |||
| Model DZ2 | |||||
| up to 267000 | 1931 | 9,10 | |||
| 271000 | 1932 | 9,10 | |||
| Model DZ3 | |||||
| 272000 | 1932 | 9,10 | |||
| 278000 | 1933 | 9,10 | |||
| Model DZ33 | |||||
| up to 279000 | 1933 | 9,10 | |||
| 500000-528000 | 1934 | Since 1934 all Ideal and Erika Numbers running consequently starting at 500000 | 9 | ||
| up to 576000 | 1935 | 9 | |||
| 654000 | 1936 | 9 | |||
| 743000 | 1937 | 9 | |||
| 835000 | 1938 | 9 | |||
| 840000 | 1939 | 9 | |||
| 950000 | 1940 | 9 | |||
| 1005000 | 1941 | 9,13 | |||
| 1008000 | 1942 | 9 | |||
| 1015000 | 1943 | 13 | |||
| 1020000 | 1944 | 13 | |||
| 1060000 | 1945 | 13 | |||
| Portable | |||||
| Erika | |||||
| Model 1 | |||||
| up to 3000 | 1910 | The three key-rows machine was named "Bijou" or "Gloria" as well | 9,10 | ||
| Model 2 | |||||
| up to 4000 | 1910 | 9,10 | |||
| 7000 | 1911 | 9,10 | |||
| Model 3 | |||||
| up to 10000 | 1911 | 9,10 | |||
| 18000 | 1912 | 9,10 | |||
| 25000 | 1913 | 9,10 | |||
| 28000 | 1914 | 9,10 | |||
| 29000 | 1915 | 9,10 | |||
| 31000 | 1916 | 9,10 | |||
| 33000 | 1917 | 9,10 | |||
| 36000 | 1918 | 9,10 | |||
| 40000 | 1919 | 9,10 | |||
| 46000 | 1920 | 9,10 | |||
| 53000 | 1921 | 9,10 | |||
| 62000 | 1922 | 9,10 | |||
| 70000 | 1923 | 9,10 | |||
| 74000 | 1924 | 9,10 | |||
| 80000 | 1925 | 9,10 | |||
| Model 4 | |||||
| up to 80000 | 1925 | 9 | |||
| 85000 | 1926 | 9,10 | |||
| 88000 | 1927 | 9,10 | |||
| 90000 | 1928 | 9 | |||
| Model 5 | |||||
| up to 109000 | 1928 | Four key-rows, Tabulator | 10 | ||
| 126500 | 1929 | 10 | |||
| 145500 | 1930 | 10 | |||
| 162000 | 1931 | 9,10 | |||
| 177500 | 1932 | Set-Tab. | 10 | ||
| Model 6 | |||||
| up to178000 | 1932 | 9 | |||
| 203500 | 1933 | Modell M, normal Model 6 and Model S, simplified Model 6 | 10 | ||
| up to 528000 | 1934 | new serial numbers since 1934, grouped with Ideal, see above | 9 | ||
| 600000 | 1936 | 13 | |||
| 680000 | 1937 | 13 | |||
| 740000 | 1938 | 13 | |||
| 840000 | 1939 | 13 | |||
| 950000 | 1940 | 13 | |||
| 1005000 | 1941 | 13 | |||
| 1008000 | 1942 | 13 | |||
| 1130200 | 1944 | 13 | |||
| 1146600 | 1947 | 13 | |||
| 1166000 | 1949 | 13 | |||
| Models 8, 9 10 | |||||
| over 1300000 | 1950 | Model 8 ended 1950 | 13 | ||
| over 1312000 | 1951 | 13 | |||
| over 1700000 | 1953 | 13 |