Hi David, A beautiful bass! I have a 1986 Distillate and like Pauldo I love my Distillate too.
That wood is stunning and in good condition for that age.
The small crack by the jack may just be a surface / finish stress crack, look closely and perhaps from inside, not a deal breaker. A gentle touch when inserting or removing the cable on any instrument is a good habit to develop for this reason, the area around any jack is a stress location.
I would explore a new case for it if you buy it; the two wooden compartments inside the current case are of concern; too close to the neck and nothing to prevent the neck from bouncing into the sides. The strap button has gouged into the wood of one compartment already (pictured) which tells me the bass is not secured within the case. Plus the top of the compartments line up where the nut /head stock scarf are, the thinnest part of the neck. I need a new case for my Distillate too, a good investment.
I think you would be very happy with the Distillate. Negotiate a good price (new case cost perhaps?) and you will be very happy.
Keep us posted, best of luck
Southpaw