It's a 93. A couple of thoughts come to mind as to why the shifters don't match the specs. First, this was when Schwinn was entering bankruptcy, and things changed with little or no notice in those days. They were still importing bikes from Giant, bought into the China Bicycle Company, and were trying to import bikes from Hungary (I believe Greensville was closed by this time). Another thought, that might be tied to the first, is that around this time, SRAM only had shifters available. To source a bike with SRAM shifters, you ended up paying more for components from Shimano (Suntour went away around this time too), because you were not buying the complete groupo. SRAM ended up taking Shimano to court, and settled out of court some time later. My thought is that if Schwinn was looking for every way possible to save a penny, and SRAM would have cost more, it's feasible they just put the shifters you have on there now to save a buck.
Just speculating, who knows.
Great find for $35 though