It was a cost-reduced V15V-HE and sounded very much like its big brother. The cantilever was the same as the V's (according to Les Watts), but I suspect the cantilever damping wasn't as sophisticated as in the original V and later V15VxMR, which is why the tracking specs aren't as good, though still impressive.
The body is the Era III SC35C's in an Era V mounting cap. No laminated core, nothing fancy except the beryllium cantilever. The p-mount version is the VST III-P.
Like many Shures of that era, aging/environmental effects on the rubber suspensions have varied from minor hardening to complete immobility. I've found rubber-restorer treatments to be helpful in all but the more extreme cases.
Another thing to check if you find any old Shure stylus with a damper brush (aka Dynamic Stabilizer): the grease in the pivots. You may need to revive the grease with a dotlet of 80k- 100k cSt silicone oil. Do the pivots one at a time and test the drop time after each one. Pop off the cap covering the pivot, but don't remove the existing grease-- it's got a conductive pigment that lets the brush drain off static charge. Stir the fresh oil into the existing goo with a straight pin or similar tool, then snap the cap back on. Wipe off any excess. Work the pivots a bit to get the new oil mixed in, then lift the brush and let it drop, timing the interval. Aim for a 1 to 3-second drop time, according to Shure's customer service folk.
The lower inductance of the VST III / V15 RS / V15 Pro-S body makes it a good home for the N97xE stylus. Doesn't solve all the problems of the xE but helps bring some sparkle back into its life.