After today's update Details now says Graphics - Gallium 0.4 on NVA5.
Over the past year or so, Details has had the occasional moment of clarity when it recognised my Nvidia GT220 as a GT210. But those moments quickly passed. Usually it shows Graphics - Unknown.
Now its says Gallium 0.4 on NVA5. I am using Nouveau. And I am curious. Synaptic cannot find anything installed called Gallium.
From a little research it seems that Gallium is the bit in Nouveau that does OpenGl rendering.
From here I see that NVA5 is a code name for Nvidia GT210, GT220 and others.
So, from now onwards let it be known that I have a NVA5. So, there!