| Barlock | |||||
| Models and s/n | Y | M | D | Remarks | Ref. |
| No. 1 | |||||
| 1887 | 6 row machine, with 78 keys for the american market and 86 keys for the continental market | 4,10 | |||
| No. 4 | |||||
| 1893 | 4,10 | ||||
| No. 6 and 7 | |||||
| 1896 | 4,10 | ||||
| No. 9 | |||||
| 1898 | 4,10 | ||||
| No. 10 and 11 | |||||
| 1900 | only 4 rows, 2 shift keys model 1902-1904 | 4,10 | |||
| No. 12 | |||||
| 1907 | carriage can be exchanged, optional 2 colour ribbon | 4,10 | |||
| No. 14 | |||||
| 1910-1914 | 7 different carriage sizes | 4,10 | |||
| No. 16 | |||||
| 300000-326000 | 1921-1924 | "Underwood" type | 6,13 | ||
| No. 17 | |||||
| 326001-335000 | 1925-1929 | 6,13 | |||
| No. 18 | |||||
| 340001-352000 | 1929-1930 | 6,13 | |||
| No. 19 and 19 a | |||||
| 360000-365000 | 1933-1935 | 6,13 | |||
| 365001-370000 | 1935-1936 | Model 19a, a booking machine started 1935 | 6,13,7 | ||
| 370001-380000 | 1936-1937 | 6,13 | |||
| Super Model 19 | |||||
| 380001-385000 | 1938 | 6,13 | |||
| 385001 and over | 1939 | 6,13 | |||
| Model 20 | |||||
| First produced | 1939 | Feb | 6,13 | ||
| 500001-504303 | 1939 | 6,13 | |||
| 504304-511223 | 1940 | 6,13 | |||
| 511224-519746 | 1941 | 6,13 | |||
| 519747-527198 | 1942 | 6,13 | |||
| 527199 onwards | 1943 | 6,13 | |||
| Model 20W | |||||
| 600000-604695 | 1943 | 6,13 | |||
| 604696-610561 | 1944 | 6,13 | |||
| 610562-618149 | 1945 | 6,13 | |||
| 618150 onwards | 1946 | 6,13 | |||
| Model 21 | |||||
| 700000-705731 | 1946 | 6,13 | |||
| 705732-712349 | 1947 | 6,13 | |||
| 712850-720700 | 1948 | 6,13 | |||
| 720701 onwards | 1949 | 6,13 | |||
| Model 22 | |||||
| 800000-806878 | 1949 | 6,13 | |||
| 806879-814964 | 1950 | 6,13 | |||
| 814965-823017 | 1951 | 6,13 | |||
| 823018-824821 | 1952 | 6,13 | |||
| 824822 onwards | 1953 | Next models were called "Byron" | 6,13 | ||
| Portables | |||||
| 3 key-row Paortable | See Bar-Let | 13 | |||
| 4 key-row Portable | |||||
| To 2810 | 1938 | 6 | |||
| 2811 to 5810 | 1939 | 6 |