There are probably dozens of groups called the Mystics, and the same too for the Emotions, and I can’t tell you anything about either of the groups that cut disc’s on Marquette Records under those names. (n.b. neither do I know anything about Rick Baker)
However, I thought I’d share the little I know about Marquette Records itself, out of Pacifica, California
In his early 30’s, and for a short time, Marshall Johnson owned Marquette Records, Mark II, Songwriter, Inc. and an exotic clothing shop for entertainers called MJ of the Bay. Born in Memphis, Tennessee he also counted himself as musician, promoter, and owner of at least two properties in Fairmont, Pacifica (plus one which he rented under the name Frank Howard). You would be hard pressed to have missed him if you lived near Sunshine Drive because he drove a powder blue Rolls Royce.
Unfortunately driving a Rolls brought its problems with the Police, and he had several run-in’s without being charged for anything.
On the Emotions, Marquette 45, Melvin (Tank) Jernigen[sic] turns up as arranger, and we can find him on the likes of Ruby Sherry, Watts 103rd etc.
past posts Soul source
https://www.soul-source.co.uk/forums/topic/235488-columbus-recorders-acetate-of-rick-baker-thats-called-love/
https://www.soul-source.co.uk/forums/topic/352793-mystics-mystiques/