Suntour was amazing in that they made so many variants and changes between models. You'd think they would have messed up more often but they consistently put out lightweight, efficient gears with a few exceptions. The Vx was only 7 grams heavier than a Campy NR and worked better but you'd never see one in a race.
I called this a VxT but it's really a VxS, which was a mid-cage that came with either a standard style cage or the quick cage seen here. The box has TOURING slapped all over it and it was rated for 30 teeth. Again, it would likely do a 32.
Here's some better pics. It has a little industrial 'Deco' feel to it.
