The following table lists the chronology and
serial numbers of the various SQN mixers
Model Date Serial Nos.
SQN-3 Type C June 1980 - 1990 3C-1000 onwards
SQN-3 Type M 1980 - 1981 3M-1001 onwards
SQN-3M Series 2000 1981 - 1991 3M-2000 onwards
SQN-3M Series 3000 1991 - 2002 3M-3000 onwards
SQN-3M Series 4000 2002 - 2005 3M-35000 onwards
 
SQN-4S (Series I) June 1985 - Feb. 1987 4S-4000 onwards
SQN-4S Series II Feb. 1987 - Feb. 1993 4S-4400 onwards
SQN-4S Series III Feb. 1993 - Oct. 1993 4S-43000 onwards
SQN-4S Series IIIa Oct. 1993 - March 1997 4S-43100 onwards
SQN-4S Series IV March 1997 - Nov. 1999 4S-50000 onwards
SQN-4S Series IVe Nov. 1999 - June 2005 4S-51000 onwards
 
SQN-2S June 2002 - Nov. 2006 2S-60000 onwards
 
SQN-4S_mini Dec. 2006 - July 2010 4SM-61000 onwards
SQN-4S_mini mk II July 2010 - current 4SM-62000 onwards
 
SQN-5S Jan. 2005 - Dec. 2005 5S-55000 onwards
SQN-5S Series II Dec. 2005 - current 5S-56000 onwards