This label has apparently been known as (or is at least related to) Mobile Fidelity Records, Mobile Fidelity Productions, Mobile Fidelity Sound Lab, MFSL and Mofi. I encountered it on a Ultradisc II version of Nirvana's Nevermind album. The disc sported MFSL on the side (opposite the catalog number) and had a logo of the "mobile fidelity sound lab" marked "a division of MFSL, Inc".
Someone who is more knowledgeable of the label's history might clarify this a bit.
Mobile Fidelity Sound Lab (MFSL or MoFi) is a re-issue record label known as an innovator in the production of audiophile-quality sound recordings. All of the label's releases are created from the first-generation analog master recordings via a custom-engineered tape machine. MFSL has issued titles on LP,cassette tape, DAT, CD and SACD. Each title is licensed from the original record company for a limited period of time and production runs are usually restricted to a few thousand units each.Continue reading at Wikipedia...