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