Hmmm. Does anyone see an issue with the case back? The 314962 brevet number indicates a later year. My Seapearl 600 has a different case back. Flatter.
Are you planning to flip it? If so, how much are they asking? One sold on eBay recently for about $600. I’d ignore the one on C24 for $1800–that is the highest I’ve ever seen.
The case back does seem off to me as well. My Seapearl 600 does not have "Sherpa" on the back and the serial number is 98xxx. Myself, I would wait for one with its lume intact.