In the past two years, Ruger itself, and its distributors and many vendors, have inexplicably taken to calling all the smaller "mid frame" New Vaqueos just "Vaqueros" in their online literature and ads. Not only inaccurate but very confusing to folks new to the fixed-sight scene. ALL factory fixed sight .44 Specials are mid-frame New Vaqueros. (Adding to the confusion, the .44 Special NVs actually say just Vaquero on them--but they are an anomaly (so far) among the mid-frames. All other (calibers in) New Vaqueros say so on the frame, again so far. ALL factory .44 Mag fixed sights are Vaqueros (as in large frame like the "regular" NM Blackhawks). Any of the latter Vaqueros--of any caliber--built after 2005 or so were "clean up" or reportedly even new runs requested by distributors like Davidsons, and in the past few years the "warning" has been on the underside of the barrel. So that 2008 mentioned above was another one of those "special runs" as they otherwise had been decommissioned from the regular Ruger catalog three or four years earlier.
+1 on the comments about the New Vaquero not being a weak gun. They're very tough just not large enough for "magnum level" loads in either .44(M) or.45...but otherwise have other quality improvements/features like the aligning-indexing pawl. I own and enjoy several of both models. Both "generations" are great guns.
Edit: someone's going to pick on this for overgeneralizing fixed versus adjustable sight models. By factory fixed sight I'm referring to the "cowboy"/Colt SAA-style smoothed and grooved top strap (versus the typical Blackhawk) and rounded "Colt SAA" style fixed front sight configuration.