No, that's a single stage. A dual stage will always have some sort of "bump" behind the gauges. Look at the pics for the other 3 listings if you type in what you have in caps, specifically the pics of the back end of the regs.
Here's a current Concoa series listing with .pdf's:
Not sure exactly what the first one (the one you specifically were referring to) is, but the other 3, which are pics of the same reg, are 412's (duals).