A few quick facts about the 850's.
The 850i and 850Ci are essentially the same car, BMW only opting to add the C designation a few years down the production because of the other C coupes like 325Ci etc. The 850Ci was powered by a 5.0l V12 M70 producing 300hp and some were released with the M73 5.4l V12 which produced 326hp. The 850Csi was a specially produced version (from 1992 to 1996) which had the S72B56 5.6l V12, which surmized a beefy 380hp. The 850Csi was only available in 6 speed manual, whereas the 850Ci was only in auto except for a few 6 speed manuals that were produced for the European market (manuals were never released in the US). Only 1510 850Csi's were ever built, of those only 160 were right hand drive versions.
The "S" engine designation confirms it was built by M//, the VIN numbers for the 850Csi's also start with WBS, also the M// designation.
Where is that Csi in the first photo's from? Is it a right hand drive?