as of 2003, serial number as of 15.30X/1000
as of 01/1987 to 06/1995, serial number 15.30X/ - English version upon request
as of 05/1982 to 06/1985, serial number 15.10X/ - English version on request
as of 01/1982 to 1983, serial number 15.10X/ - English version on request