To me that looks like Amazon putting up the details from the CD release date which they then ripped to MP3 decades later. The copyright date being 1985 makes me think this.
In 1985 Amazon was still a rain forest. We were still using UNIX as no Linus yet to start his project. We just about had DOS 3.0 on an early PC…
CDs were only 2 years old at that stage - so it more likely to be a Vinyl or cassette date.
Yeah… that is a bogus date for “digital media”. I’m trying to imagine what would be able to play “digital media” at that time. We still thought the Sony Walkman was cool!
Drop the release date into the Annotation for now. As you have 1983 or 1984 it has narrowed it down for further research.
LOL @Freso - do I recognise “if in doubt, leave it out” from somewhere? LOL. I’m sure I came up with that phrase. 
This needs to be said in a Cockney \ Eastenders accent to get the correct tone to it.