To the best of my knowledge, there were five models of the Panasonic MJ minidisc player (only the latest model was not advertised by Ayu):
SJ-MJ50 (2001)
SJ-MJ55 (2002)
SJ-MJ57 (2003)
SJ-MJ59 (2004)
SJ-MJ500 (2005)
SJ-MJ50
SJ-MJ55
SJ-MJ57
SJ-MJ59
SJ-MJ500
Detailed information is provided only for SJ-MJ59
Thanks to LeButler for the video files of commercials.
Most images (except SJ-MJ59) are from Yahoo Auctions - Japan

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