Looks like an older KWA to me, though I'm no expert on the matter.
KWA/KSC is the same thing, just USA/Asia respectively, both are made in the same place though.
TM based ones don't have Auto capability, this may not have it currently because the switch appears to be missing, but it has had it in the past. (Circular wear near the back of the left hand side of the slide)
WE ones have always been marked as such on the lower frame, and the paint on the slide is more grey than black with those.
KWC have only ever made 17/18c's AFAIK.
By process of elimination, this is almost certainly a KSC, as KWA will have at least some trades, but this doesn't.
Edit: KJW did used to make one, but its a marginally offspec TM pattern (ie mags aren't cross compatible etc), but that would've been a dead giveaway, as they for reasons only known to KJW used shiny plastic for the lower frame.
