I had a closer look at this and it actually confirms that there may have been some factory RHD cars built after mid 1972.I found this, which may be of interest.
BMW E9 CS Coupés 2017 Market watch - Drive
Market watch: BMW E9 CS Coupés. This month we take a break from the auction floor and have a look at the E9 Coupé with the help of the BMW Car Club’s John Castle and Nick Hull from the club’s CS register.drive-my.com
The BMW classic site does seem to confirm no RHD CSI was built before 11/73, so the earlier RHD cars must have been converted.
So you have a 2265 factory RHD 3.0 CSI
and I have a 2265 factory RHD 3.0 CSI.
So maybe there are a few more survivors out there too that could chime in , that way it would be good to maybe get the records updated to show our 2265 on the list of vin numbers for factory RHD 3.0 CSI’s
I have sent an email to Bmw to shed more light on this but they are on holiday until the 10th of January, so maybe after that they will let me know some more info