Perhaps a bit more detail would help?
I can only recall the Pharaoh, circa early 80’s, IIRC it was a winter bag, no idea of rating.
Phoenix were well renowned, innovative and well made quality kit, I’ve still got a few bits in use.
The tents have a bit of a deservedly cult following. Do some homework, search the net and maybe keep an eye on eBay to see if any sleeping bags come up?