Based on the dates codes on the brakes (NK/OB - Nov-89/Feb-90), cranks (PF/NJ - Jun-91/Oct-89) and the stamping on the Turbo (July 89) it would seem that this particular Manitou is a 1990/91 model year.
Here are are few pics from the original eBay auction, more to come as I get into it:
I was hoping this frame would be a bit larger than my current one, but as luck would have it is almost identical to the 89 I have, the basic dimensions are all the same.
It appears to have suffered a seat tube failure at the seat binder bolt at some point and was repaired with an new collar. I've seen another Manitou with a similar repair, so it does that these frames were not immune to catastrophic failure.
Unlike my 89 this one came with a black bodied Shimano rear hub, perhaps another sign of the vintage.