You're welcome Brendan.
The lack of markings is another indication that the knife may have been reworked. It could also be that the knife was made before the year 2000, as I believe that was when they started marking the inside of the slabs. Incidently, the markings may tell the year the slabs were made but not, necessarily, when the knife was made. (I have a small Seb with 00 on the slabs but the knife was made in 2001.)
I have an older model Large Sebenza that has no markings on the slabs. It is the first one that I ever sold. That was in early 1998. I got it back in 2001 from the person who bought it when he traded it in on another knife. I sent it in to CRK in 2002 when the S30V came out to have the blade changed over to the new steel. The handles were refinished by CRK at that time but there were no markings before I sent it in and there are no markings now.
The lack of the "S" on the blade doesn't, necessarily mean that the blade isn't S30V but if the knife has no markings inside the handles and it is the original blade then it is probably a BG42 blade as it was made before 2000 and S30V wasn't around till about 2002. However, if the knife was sent to CRK for a blade change, as mine was, (There is no "S" on my blade), it could very well be S30V. Also, if the knife is pre-2000, then it isn't a flat grind as that was a 2001 project.
Those serrations, though, do not match anything I've ever seen from CRK.