Nice find!
I've found a few like that but they're not particularly common ... i've taken to checking ringed planets from the system map to see how large the rings are before i decide if it's worth going for a closer look. If the inner radius of the B (or C if it has 3) ring is significantly larger than the outer radius of the A ring then there's a chance it will look like the one you found, but there's probably a 9 in 10 chance that the massive outer rings will be totally invisible (but need to be careful as you can still collide with them).
My forum avatar is of such a planet i found, with the DW logo text superimposed on top.