To me it looks like the S1898 and i think you mean maker WKC ? stamped with the 07 for 1907?
Price aint that bad if its regimental marked.
btw they are not that rare, the S1898aA are rare, they have a grip made out of 1 piece, yours i believe has already the 2 separate gripplates
Here to compare wuth the S1898 aA
SeitenGewehr 1898 alter Art