This should be 250k, and it should be labeled somewhere on the pot. This pickguard uses the Yngwie Speed Pot for volume. You might try spraying some contact cleaner, like Deoxit, into the pot- this usually clears it up as well.
I have the same set and mine is 250k. Personally I don't particularly like the feel of the high speed pot even though it seems to be a high quality pot. Just a preference thing. If I replace it I will go with CTS 250k and if you'll look around you can find them with tighter tolerance levels when you buy. A friend of mine likes the CTS line made for Angela instruments, for example.
BTW, I noticed that the tone knob at the very bottom is not wired straight from the factory. Is that just a dummy pot or a real pot sitting there but just not wired up?
Hmm. Do you mean it's got no wires going to it at all? Mine is completely wired up with both tones IIRC.
There are wires going to it but it's got no control. The last time my luthier told me that's normal. But I might consider having it wired up for tone control over the bridge pickup.