Established in 1977 by Brad Miller, MFSL specializes in remastering major-label music for the "audiophile" market. CD releases began in 1984.

Copyright dates are often left unchanged from the original release; Most MFSL releases are issued a year or so later, please leave release date blank if you are unsure.
First Gold Ultradisc™ CD: 1987-02
First Gold Ultradisc II™ (Made in USA) CD: 1992-09

Please add all branded labels to MFSL releases. A label logo=label.

These links are a useful tool to pinpoint the dates of MFSL releases.
Full Archive: http://www.mofi.com/Articles.asp?ID=257
Vinyl: http://www.mofi.com/v/vspfiles/assets/images/omrlp.txt
Cassettes: http://www.mofi.com/v/vspfiles/assets/images/omrcs.txt
Gold CDs: http://www.goodwinshighend.com/music/mfsl_gold_cd.htm#MFSL%20Gold%20CD%20Listing%20by%20Catalog%20Number
On that site, a small blue V in front of cat# means that there are both Ultradisc™ and Ultradisc II™ (later reissue) versions, date is from first (non Ultradisc II) release.

Items released commercially as numbered editions were frequently also released as unnumbered promotional copies. These promos should be entered separately from the numbered retail copies.
At least the releases from the first three years were limited editions throughout and wear a sticker with this information on the shrink.

In an email dated 17 December 2018, Mobile Fidelity Sound Labs Customer Service confirms that “all of [their] releases are remastered by [their] Sound Labs. No exceptions.” Please see https://www.discogs.com/forum/thread/782766 for full emails and discussion.