All of the recordings Miles did for Prestige were made in 1955/56 - - before stereo. Your record is a mono recording - - and that ain't a bad thing.
Was this Miles Davis Steamin LP a rare find?
I just picked this up, QRP Sealed. I checked AS website just to see if I could have purchased it online, and it's only available in mono. At that point, I figured that's what I grabbed from the record shop. But after checking the LP, it does not indicate it's mono anywhere. The spine says prestige 7200, back bottom says copyright 2014 Analog productions. Gold QRP logo as normal on outer sleeve. I assume what I purchased was a recently OOP stereo version.