What sort of electronics are on this Stanley Clarke?  Only 3 knobs and one switch.

No pic for me... But the description sounds like Essence with Q switch. It's not a Stanley Clarke model in that case, but custom orders with Small Standard bodies (and even Series I/II) are often called Stanley models incorrectly.

Ah, well here it is.

Sweet Bird's-eye Maple! Of course, I can't see what' s behind the knobs, but I'd guess vol, pan, filter, Q switch.  
 
The neck construction is that of an Essence, so this is not a Stanley model. Tiny truss rod cover, neck pickup is like the old ones that didn't even have a cover.

Another indication that this is an Essence is that the standard Essence does not have neck inlays.