Oops, I’ve done it again, gone and bought another CPC 664, this one certainly looks beautiful sitting right next to my trusty CPC 6128.
The colour looks to me like it was painted, that might explain the lack of a serial number underneath (perhaps). That said, it’s in lovely condition, feels like new. Even if this was painted I can’t see any evidence (other than the colour looking slightly blue) that it was painted, so clearly a very well done job.
If you look at my growing collection below it’s the the 664 just on top of the grey Schneider coloured 464.